"use strict"; const {Fragment: _Fragment, jsx: _jsx, jsxs: _jsxs} = arguments[0]; const {useMDXComponents: _provideComponents} = arguments[0]; function _createMdxContent(props) { const _components = { code: "code", h1: "h1", h2: "h2", h3: "h3", hr: "hr", li: "li", p: "p", pre: "pre", span: "span", strong: "strong", ul: "ul", ..._provideComponents(), ...props.components }; return _jsxs(_Fragment, { children: [_jsx(_components.h1, { children: "Instructions: Real-time Data with WebSockets" }), "\n", _jsx(_components.p, { children: "Follow these step-by-step instructions to build your first real-time React application with WebSocket integration. This exercise will reinforce the real-time communication concepts you learned in the lesson and guide you through creating a live chat application that demonstrates professional WebSocket patterns with React." }), "\n", _jsx(_components.h2, { children: "Concept Reinforcement" }), "\n", _jsx(_components.p, { children: "Before we start coding, let's review the key React concepts you'll be applying in this exercise:" }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Real-Time Communication" }), ": You'll implement WebSocket patterns that enable instant, bidirectional communication between users. This demonstrates how modern React applications handle live data updates without page refreshes or constant polling."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Connection State Management" }), ": You'll manage multiple connection states - connected, connecting, disconnected, and error - to provide users with clear feedback about their real-time connection status and ensure excellent user experience."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "useEffect for Connection Lifecycle" }), ": You'll use the useEffect hook to manage WebSocket connection establishment, event handling, and cleanup, showing how React components can handle persistent connections and real-time data streams."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Real-Time State Updates" }), ": You'll handle incoming messages and user presence updates that arrive at any time, demonstrating how React state management works with unpredictable, real-time data flows."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Component Communication" }), ": You'll build a modular chat application with separate components for message display, user input, and connection status, showing how real-time data flows through React component hierarchies."] }), "\n", _jsx(_components.h2, { children: "The Challenge" }), "\n", _jsx(_components.p, { children: "Create an interactive live chat application that demonstrates React's real-time capabilities:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "A real-time messaging interface where users can send and receive messages instantly" }), "\n", _jsx(_components.li, { children: "Connection status indicators showing current connection state with visual feedback" }), "\n", _jsx(_components.li, { children: "Live message updates from simulated users that appear automatically" }), "\n", _jsx(_components.li, { children: "Professional chat features including timestamps, user identification, and message history" }), "\n", _jsx(_components.li, { children: "Connection lifecycle management with proper establishment, maintenance, and cleanup" }), "\n", _jsx(_components.li, { children: "Error handling with graceful recovery and clear user feedback" }), "\n", _jsx(_components.li, { children: "Responsive real-time UI with smooth animations and immediate visual feedback" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Success Criteria:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "✅ Chat app displays connection status and message interface on initial load" }), "\n", _jsx(_components.li, { children: "✅ Connection state changes from \"connecting\" to \"connected\" with visual indicators" }), "\n", _jsx(_components.li, { children: "✅ Users can send messages that appear instantly in the chat" }), "\n", _jsx(_components.li, { children: "✅ Simulated messages from other users appear automatically every few seconds" }), "\n", _jsx(_components.li, { children: "✅ Connection status updates provide clear feedback about real-time connection state" }), "\n", _jsx(_components.li, { children: "✅ Component uses useEffect for WebSocket connection lifecycle management" }), "\n", _jsx(_components.li, { children: "✅ Multiple state variables coordinate to manage real-time data and connection states" }), "\n", _jsx(_components.li, { children: "✅ Professional appearance with provided CSS styling and smooth animations" }), "\n", _jsx(_components.li, { children: "✅ Excellent user experience with immediate feedback for all real-time interactions" }), "\n"] }), "\n", _jsx(_components.h2, { children: "Independent Learning Opportunity" }), "\n", _jsx(_components.p, { children: "Before looking at the step-by-step guide below, try building this chat application yourself! Use these React concepts you've learned:" }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "React Concepts to Use:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Functional components with JSX for building the chat interface" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useState" }), " hook for managing messages, connection state, and user input"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useEffect" }), " hook for WebSocket connection lifecycle and cleanup"] }), "\n", _jsx(_components.li, { children: "Event handler functions for sending messages and managing user interactions" }), "\n", _jsx(_components.li, { children: "Conditional rendering to show different UI based on connection state" }), "\n", _jsx(_components.li, { children: "Component composition with separate files for modular architecture" }), "\n", _jsx(_components.li, { children: "Real-time state updates for handling incoming messages and connection events" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Conceptual Hints:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Think about what data needs to change in real-time (messages, connection status, user presence)" }), "\n", _jsx(_components.li, { children: "Consider the WebSocket connection lifecycle (connecting, connected, disconnected, error)" }), "\n", _jsx(_components.li, { children: "Remember that real-time data can arrive at any time from external sources" }), "\n", _jsx(_components.li, { children: "Use useEffect to establish connections when components mount and clean up when they unmount" }), "\n", _jsx(_components.li, { children: "Handle both user-initiated actions (sending messages) and system events (receiving messages)" }), "\n", _jsx(_components.li, { children: "Provide immediate visual feedback for all user actions and connection state changes" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Simulated WebSocket Pattern:" }) }), "\n", _jsx(_components.pre, { className: "language-javascript", children: _jsxs(_components.code, { className: "language-javascript code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token comment", children: "// Simulated WebSocket connection that teaches real patterns" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "2", children: [_jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "simulateWebSocketConnection" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate connection establishment delay" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", children: [" ", _jsx(_components.span, { className: "token function", children: "startReceivingMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "1000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "9", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [_jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "startReceivingMessages" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "11", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate receiving messages from other users" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "12", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " simulatedUsers ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token string", children: "'Alice'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Bob'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Charlie'" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "13", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " messageTemplates ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "14", children: [" ", _jsx(_components.span, { className: "token string", children: "'Hey everyone! 👋'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "15", children: [" ", _jsx(_components.span, { className: "token string", children: "'How is everyone doing today?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "16", children: [" ", _jsx(_components.span, { className: "token string", children: "'Just joined the chat!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "17", children: [" ", _jsx(_components.span, { className: "token string", children: "'Anyone working on React projects?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "18", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "19", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "20", children: [" ", _jsx(_components.span, { className: "token function", children: "setInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "21", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomUser ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "22", children: [" simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "23", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "24", children: [" messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "25", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "26", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "27", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "28", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "29", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "30", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "user" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomUser", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "31", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "text" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomMessage", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "32", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "timestamp" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toISOString" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "33", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "isOwn" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token boolean", children: "false" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "34", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "35", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "36", children: [" ", _jsx(_components.span, { className: "token function", children: "setMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token spread operator", children: "..." }), "prev", _jsx(_components.span, { className: "token punctuation", children: "," }), " newMessage", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "37", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "4000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// New message every 4 seconds" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "38", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "Try building it yourself first - it's okay if you get stuck! The step-by-step guide below will help you understand each React concept as you implement it." }), "\n", _jsx(_components.hr, {}), "\n", _jsx(_components.h2, { children: "Step-by-Step React Implementation Guide" }), "\n", _jsx(_components.p, { children: "If you need help or want to understand each React concept in detail, follow these steps:" }), "\n", _jsx(_components.h3, { children: "Step 1: Create the ChatApp Component File" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "ChatApp.js" }), " and set up the basic React component structure with simulated WebSocket functionality. This demonstrates React's component-based architecture and how to organize real-time connection logic."] }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsxs(_components.span, { className: "token imports", children: [_jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'react'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "2", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }) }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token comment", children: "// State for managing real-time 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_jsxs(_components.span, { className: "code-line line-number", line: "47", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Why we write this React code:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "import React, { useState, useEffect }" }), " gives us access to React and the hooks we need for real-time functionality"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const [messages, setMessages] = useState([])" }), " manages the array of chat messages that updates in real-time"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const [connectionState, setConnectionState] = useState('disconnected')" }), " tracks the WebSocket connection status"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const [messageInput, setMessageInput] = useState('')" }), " manages the user's current message input"] }), "\n", _jsx(_components.li, { children: "The JSX structure creates a professional chat interface with header, messages area, and input section" }), "\n", _jsx(_components.li, { children: "Conditional rendering shows different connection status indicators based on current state" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates how to set up state management for real-time applications and create the foundation for WebSocket integration."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your basic chat interface! The connection shows as disconnected, and the input is ready for user interaction."] }), "\n", _jsx(_components.h3, { children: "Step 2: Add WebSocket Connection Simulation with useEffect" }), "\n", _jsx(_components.p, { children: "Add the useEffect hook to simulate WebSocket connection establishment and lifecycle management, demonstrating how React handles persistent connections." }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsxs(_components.span, { className: "token imports", children: [_jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'react'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "2", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }) }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "messages", _jsx(_components.span, { className: "token punctuation", children: "," }), " setMessages", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "connectionState", _jsx(_components.span, { className: "token punctuation", children: "," }), " setConnectionState", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "," }), " setMessageInput", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "''" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "currentUser", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'You'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "8", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulated WebSocket connection using useEffect" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [" ", _jsx(_components.span, { className: "token function", children: "useEffect" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "11", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate connection establishment" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "12", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "connectToChat" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "13", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connecting'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "14", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "15", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate network delay for connection" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "16", children: [" ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "17", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "18", children: [" ", _jsx(_components.span, { className: "token function", children: "startReceivingMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "19", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "1500" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "20", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "21", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "22", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate receiving messages from other users" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "23", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "startReceivingMessages" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "24", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " simulatedUsers ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token string", children: "'Alice'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Bob'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Charlie'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Diana'" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "25", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " messageTemplates ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "26", children: [" ", _jsx(_components.span, { className: "token string", children: "'Hey everyone! 👋'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "27", children: [" ", _jsx(_components.span, { className: "token string", children: "'How is everyone doing today?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "28", children: [" ", _jsx(_components.span, { className: "token string", children: "'Just joined the chat!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "29", children: [" ", _jsx(_components.span, { className: "token string", children: "'Anyone working on React projects?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "30", children: [" ", _jsx(_components.span, { className: "token string", children: "'This real-time chat is amazing! 🚀'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "31", children: [" ", _jsx(_components.span, { className: "token string", children: "'Love how instant the messages are!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "32", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "33", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "34", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " messageInterval ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "setInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "35", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomUser ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "36", children: [" simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "37", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "38", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "39", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "40", children: [" messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "41", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "42", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "43", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "44", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "45", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "46", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "user" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomUser", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "47", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "text" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomMessage", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "48", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "timestamp" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toISOString" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "49", children: [" ", _jsx(_components.span, { className: 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"token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token spread operator", children: "..." }), "prev", _jsx(_components.span, { className: "token punctuation", children: "," }), " newMessage", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "53", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "4000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// New message every 4 seconds" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "54", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "55", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Return cleanup function for the interval" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "56", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " messageInterval", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "57", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "58", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "59", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Start connection process" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "60", children: [" ", _jsx(_components.span, { className: "token function", children: "connectToChat" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "61", children: [" ", _jsx(_components.span, { className: "token keyword", children: "let" }), " messageInterval", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "62", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "63", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Cleanup function - runs when component unmounts" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "64", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "65", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "66", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "67", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "68", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "69", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "70", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// Empty dependency array - run once on mount" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "71", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "72", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "73", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-app", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "74", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-header", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "75", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "h1"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "💬 Live Chat" }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "76", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "connection-status", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "77", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "span"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token script language-javascript", children: [_jsx(_components.span, { className: "token script-punctuation punctuation", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsxs(_components.span, { className: "token template-string", children: [_jsx(_components.span, { className: "token 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"connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " ", _jsx(_components.span, { className: "token string", children: "'🟢 Connected'" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "79", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'connecting'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " ", _jsx(_components.span, { className: "token string", children: "'🟡 Connecting...'" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "80", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'disconnected'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "81", children: [" ", _jsx(_components.span, { className: "token string", children: "'⚫ Disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "82", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'error'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " ", _jsx(_components.span, { className: "token string", children: "'🔴 Connection Error'" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "83", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "84", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "85", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsx(_components.span, { className: "code-line line-number", line: "86", children: _jsx(_components.span, { className: "token plain-text", children: "\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "87", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-container", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "88", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "messages-area", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "89", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "messages", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), " ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), " ", _jsx(_components.span, { className: "token operator", children: "?" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "90", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "p"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "welcome-message", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsx(_components.span, { className: "code-line line-number", line: "91", children: _jsx(_components.span, { className: "token plain-text", children: " Welcome to the live chat! 🎉\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "92", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "93", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "94", children: [" messages", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "map" }), _jsx(_components.span, { className: "token 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_jsxs(_components.li, { children: [_jsx(_components.code, { children: "setConnectionState('connecting')" }), " immediately shows users that connection is being established"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setTimeout(() => { ... }, 1500)" }), " simulates realistic network delay for WebSocket handshake"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setInterval(() => { ... }, 4000)" }), " simulates receiving real-time messages from other users"] }), "\n", _jsxs(_components.li, { children: ["The cleanup function ", _jsx(_components.code, { children: "return () => { ... }" }), " ensures intervals are cleared when component unmounts"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "messages.map(message => ...)" }), " renders all messages dynamically as they arrive"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "disabled={connectionState !== 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You'll start seeing messages from simulated users appear automatically."] }), "\n", _jsx(_components.h3, { children: "Step 3: Add Message Sending Functionality" }), "\n", _jsx(_components.p, { children: "Add the ability for users to send messages with immediate feedback, demonstrating real-time user interactions and optimistic updates." }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsxs(_components.span, { className: "token imports", children: [_jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'react'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "2", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }) }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: 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";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "connectionState", _jsx(_components.span, { className: "token punctuation", children: "," }), " setConnectionState", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: 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className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "50", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "51", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " messageInterval", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "52", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "53", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "54", children: [" ", _jsx(_components.span, { className: "token function", children: "connectToChat" }), _jsx(_components.span, { className: "token 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className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "58", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "59", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "60", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "61", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "62", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "63", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "64", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "65", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Handle sending messages with real-time feedback" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "66", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleSendMessage" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "67", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token operator", children: "!" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " connectionState ", _jsx(_components.span, { className: "token operator", children: "!==" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "68", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "69", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "70", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "71", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Create new message object" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "72", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "73", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "74", children: [" ", _jsx(_components.span, { className: "token literal-property property", 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_jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "shiftKey" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "93", children: [" e", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "preventDefault" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "94", children: [" ", _jsx(_components.span, { className: "token function", children: 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"token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "99", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-app", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "100", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-header", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "101", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "h1"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "💬 Live Chat" }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "102", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token 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_jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token script language-javascript", children: [_jsx(_components.span, { className: "token script-punctuation punctuation", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsxs(_components.span, { className: "token template-string", children: [_jsx(_components.span, { className: "token template-punctuation string", children: "`" }), _jsx(_components.span, { className: "token string", children: "status-indicator " }), _jsxs(_components.span, { className: "token interpolation", children: [_jsx(_components.span, { className: "token interpolation-punctuation punctuation", children: "${" }), "connectionState", _jsx(_components.span, { className: "token interpolation-punctuation punctuation", children: "}" })] }), _jsx(_components.span, { className: "token template-punctuation string", children: "`" })] }), _jsx(_components.span, { className: "token punctuation", children: "}" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "104", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " ", _jsx(_components.span, { className: "token string", children: "'🟢 Connected'" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line 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punctuation", children: "\"" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "154", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "message-input", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "155", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "disabled" }), _jsxs(_components.span, { className: "token script language-javascript", children: [_jsx(_components.span, { className: "token script-punctuation 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className: "token punctuation", children: "<" }), "button"] }), "\n"] })] }), _jsx(_components.span, { className: "code-line line-number", line: "158", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "onClick" }), _jsxs(_components.span, { className: "token script language-javascript", children: [_jsx(_components.span, { className: "token script-punctuation punctuation", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "handleSendMessage", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "159", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "send-button", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "160", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "disabled" }), _jsxs(_components.span, { className: "token script language-javascript", children: [_jsx(_components.span, { className: "token script-punctuation punctuation", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] })] }) }), _jsx(_components.span, { className: "code-line line-number", line: "161", children: _jsx(_components.span, { className: "token tag", children: _jsxs(_components.span, { className: "token script language-javascript", children: [" connectionState ", _jsx(_components.span, { className: "token operator", children: "!==" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), "\n"] }) }) }), _jsx(_components.span, { className: "code-line line-number", line: "162", children: _jsx(_components.span, { className: "token tag", children: _jsxs(_components.span, { className: "token script language-javascript", children: [" ", _jsx(_components.span, { className: "token operator", children: "!" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }) }) }), _jsx(_components.span, { className: "code-line line-number", line: "163", children: _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token script language-javascript", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), "\n"] }) }), _jsxs(_components.span, { className: "code-line line-number", line: "164", children: [_jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsx(_components.span, { className: "code-line line-number", line: "165", children: _jsx(_components.span, { className: "token plain-text", children: " Send\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "166", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "167", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "168", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "169", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "170", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "171", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "172", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "173", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Why we write this React code:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const handleSendMessage = () => { ... }" }), " creates an event handler for sending messages"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "if (!messageInput.trim() || connectionState !== 'connected')" }), " validates input and connection state"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setMessages(prev => [...prev, newMessage])" }), " immediately adds the user's message (optimistic update)"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setMessageInput('')" }), " clears the input field after sending"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const handleKeyPress = (e) => { ... }" }), " enables Enter key functionality for natural chat interaction"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "onKeyPress={handleKeyPress}" }), " connects keyboard events to message sending"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "onClick={handleSendMessage}" }), " connects the send button to the message handler"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "isOwn: true" }), " distinguishes user's messages from others for different styling"] }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates real-time user interactions with immediate feedback and optimistic updates - core patterns for responsive real-time applications."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " and try sending messages! Your messages appear instantly, and you'll continue receiving messages from simulated users."] }), "\n", _jsx(_components.h3, { children: "Step 4: Add Connection Error Simulation and Recovery" }), "\n", _jsx(_components.p, { children: "Add realistic connection error handling and recovery mechanisms to demonstrate robust real-time application patterns." }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsxs(_components.span, { className: "token imports", children: [_jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'react'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "2", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }) }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "messages", _jsx(_components.span, { className: "token punctuation", children: "," }), " setMessages", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "connectionState", _jsx(_components.span, { className: "token punctuation", children: "," }), " setConnectionState", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "," }), " setMessageInput", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "''" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "currentUser", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'You'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "connectionError", _jsx(_components.span, { className: "token punctuation", children: "," }), " setConnectionError", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "9", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [" ", _jsx(_components.span, { className: "token function", children: "useEffect" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "11", children: [" ", _jsx(_components.span, { className: "token keyword", children: "let" }), " messageInterval", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "12", children: [" ", _jsx(_components.span, { className: "token keyword", children: "let" }), " reconnectTimeout", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "13", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "14", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "connectToChat" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "15", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connecting'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "16", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "17", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "18", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate occasional connection failures (10% chance)" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "19", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " shouldFail ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<" }), " ", _jsx(_components.span, { className: "token number", children: "0.1" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "20", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "21", children: [" ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "22", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "shouldFail", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "23", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'error'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "24", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "25", children: [" ", _jsx(_components.span, { className: "token string", children: "'Failed to connect to chat server. Retrying...'" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "26", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "27", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "28", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Attempt reconnection after delay" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "29", children: [" reconnectTimeout ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "30", children: [" ", _jsx(_components.span, { className: "token function", children: "connectToChat" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "31", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "3000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "32", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "else" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "33", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "34", children: [" ", _jsx(_components.span, { className: "token function", children: "startReceivingMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "35", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "36", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "1500" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "37", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "38", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "39", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "startReceivingMessages" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "40", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " simulatedUsers ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token string", children: "'Alice'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Bob'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Charlie'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Diana'" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "41", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " messageTemplates ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "42", children: [" ", _jsx(_components.span, { className: "token string", children: "'Hey everyone! 👋'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "43", children: [" ", _jsx(_components.span, { className: "token string", children: "'How is everyone doing today?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "44", children: [" ", _jsx(_components.span, { className: "token string", children: "'Just joined the chat!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "45", children: [" ", _jsx(_components.span, { className: "token string", children: "'Anyone working on React projects?'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "46", children: [" ", _jsx(_components.span, { className: "token string", children: "'This real-time chat is amazing! 🚀'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "47", children: [" ", _jsx(_components.span, { className: "token string", children: "'Love how instant the messages are!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "48", children: [" ", _jsx(_components.span, { className: "token string", children: "'Great to see everyone here!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "49", children: [" ", _jsx(_components.span, { className: "token string", children: "'The WebSocket connection is so smooth!'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "50", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "51", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "52", children: [" messageInterval ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "setInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "53", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate occasional connection issues during chat" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "54", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<" }), " ", _jsx(_components.span, { className: "token number", children: "0.05" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "55", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 5% chance of connection issue" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "56", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'error'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "57", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "58", children: [" ", _jsx(_components.span, { className: "token string", children: "'Connection lost. Attempting to reconnect...'" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "59", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "60", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "61", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "62", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate reconnection" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "63", children: [" reconnectTimeout ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "64", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "65", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "66", children: [" ", _jsx(_components.span, { className: "token function", children: "startReceivingMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "67", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "2000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "68", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "69", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "70", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "71", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomUser ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "72", children: [" simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "73", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " simulatedUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "74", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "75", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " randomMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "76", children: [" messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "77", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " messageTemplates", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "78", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "79", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "80", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "81", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "82", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "user" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomUser", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "83", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "text" }), _jsx(_components.span, { className: "token operator", children: ":" }), " randomMessage", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "84", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "timestamp" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toISOString" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "85", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "isOwn" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token boolean", children: "false" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "86", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "87", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "88", children: [" ", _jsx(_components.span, { className: "token function", children: "setMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token spread operator", children: "..." }), "prev", _jsx(_components.span, { className: "token punctuation", children: "," }), " newMessage", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "89", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "4000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "90", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "91", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "92", children: [" ", _jsx(_components.span, { className: "token function", children: "connectToChat" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "93", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "94", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "95", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "96", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "97", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "98", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "reconnectTimeout", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "99", children: [" ", _jsx(_components.span, { className: "token function", children: "clearTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "reconnectTimeout", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "100", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "101", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "102", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "103", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "104", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "105", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleSendMessage" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "106", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token operator", children: "!" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " connectionState ", _jsx(_components.span, { className: "token operator", children: "!==" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "107", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "108", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "109", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "110", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "111", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "112", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "user" }), _jsx(_components.span, { className: "token operator", children: ":" }), " currentUser", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "113", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "text" }), _jsx(_components.span, { className: "token operator", children: ":" }), " messageInput", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "114", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "timestamp" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toISOString" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "115", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "isOwn" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token boolean", children: "true" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "116", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "117", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "118", children: [" ", _jsx(_components.span, { className: "token function", children: "setMessages" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token spread operator", children: "..." }), "prev", _jsx(_components.span, { className: "token punctuation", children: "," }), " newMessage", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "119", children: [" ", _jsx(_components.span, { className: "token function", children: "setMessageInput" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "''" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "120", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "121", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "122", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleKeyPress" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token parameter", children: "e" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "123", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "e", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "key" }), " ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'Enter'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " ", _jsx(_components.span, { className: "token operator", children: "!" }), "e", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "shiftKey" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "124", children: [" e", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "preventDefault" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "125", children: [" ", _jsx(_components.span, { className: "token function", children: "handleSendMessage" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "126", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "127", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "128", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "129", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Manual reconnection function" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "130", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleReconnect" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "131", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'error'" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " connectionState ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "132", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connecting'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "133", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "134", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "135", children: [" ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "136", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "137", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Note: In a real implementation, you would re-establish the WebSocket connection here" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "138", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "1500" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "139", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "140", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "141", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "142", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "143", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-app", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "144", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "chat-header", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "145", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "h1"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "💬 Live Chat" }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), _jsx(_components.span, { 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": This demonstrates professional error handling and recovery patterns for real-time applications, ensuring excellent user experience even during connection issues."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " and experience the complete real-time chat! 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}), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "App", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), _jsx(_components.span, { className: "token class-name", children: "ChatApp" })] }), " ", _jsx(_components.span, { className: "token punctuation", children: "/>" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "11", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "12", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "13", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "App" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Why we write this React code:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "import ChatApp from './ChatApp'" }), " imports your custom real-time chat component"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "import './styles.css'" }), " imports the CSS file for professional chat styling"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "" }), " uses your component as a JSX element in the app"] }), "\n", _jsx(_components.li, { children: "The App component acts as the root component that renders your real-time application" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates React's component composition - how you build complex real-time applications by combining focused, reusable components."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete live chat application! The ChatApp component is now rendered inside the App component with full real-time functionality."] }), "\n", _jsx(_components.h3, { children: "Step 6: Add Enhanced Real-Time Features" }), "\n", _jsx(_components.p, { children: "Let's add some final enhancements that make the chat feel even more professional and demonstrate advanced real-time patterns." }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx code-highlight", children: [_jsxs(_components.span, { className: "code-line line-number", line: "1", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsxs(_components.span, { className: "token imports", children: [_jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect", _jsx(_components.span, { className: "token punctuation", children: "," }), " useRef ", _jsx(_components.span, { className: "token punctuation", children: "}" })] }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'react'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "2", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }) }), _jsx(_components.span, { className: "token punctuation", children: "(" }), 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_jsx(_components.span, { className: "token string", children: "'Charlie'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Diana'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token string", children: "'Eve'" }), _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "104", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "105", children: [" userActivityInterval ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "setInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "106", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate users joining and leaving" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "107", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " action ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<" }), " ", _jsx(_components.span, { className: "token number", children: "0.7" }), " ", _jsx(_components.span, { className: "token operator", children: "?" }), " ", _jsx(_components.span, { className: "token string", children: "'join'" }), " ", _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'leave'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "108", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " availableUsers ", _jsx(_components.span, { className: "token operator", children: "=" }), " allUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "filter" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "109", children: [" ", _jsx(_components.span, { className: "token parameter", children: "user" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token operator", children: "!" }), "onlineUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "includes" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "user", _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "110", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "111", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "112", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "action ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'join'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " availableUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), " ", _jsx(_components.span, { className: "token operator", children: ">" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "113", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newUser ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "114", children: [" availableUsers", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "115", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " availableUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "116", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "117", children: [" ", _jsx(_components.span, { className: "token function", children: "setOnlineUsers" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), _jsx(_components.span, { className: "token spread operator", children: "..." }), "prev", _jsx(_components.span, { className: "token punctuation", children: "," }), " newUser", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "118", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "else" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "action ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'leave'" }), " ", _jsx(_components.span, { className: "token operator", children: "&&" }), " onlineUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), " ", _jsx(_components.span, { className: "token operator", children: ">" }), " ", _jsx(_components.span, { className: "token number", children: "1" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "119", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " userToRemove ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "120", children: [" onlineUsers", _jsx(_components.span, { className: "token punctuation", children: "[" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "121", children: [" ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "floor" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "random" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "*" }), " onlineUsers", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "122", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "123", children: [" ", _jsx(_components.span, { className: "token function", children: "setOnlineUsers" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "124", children: [" prev", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "filter" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "user" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " user ", _jsx(_components.span, { className: "token operator", children: "!==" }), " userToRemove", _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "125", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "126", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "127", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "8000" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// User activity every 8 seconds" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "128", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "129", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "130", children: [" ", _jsx(_components.span, { className: "token function", children: "connectToChat" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "131", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "132", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "133", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "134", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "messageInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "135", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "136", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "reconnectTimeout", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "137", children: [" ", _jsx(_components.span, { className: "token function", children: "clearTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "reconnectTimeout", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "138", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "139", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "userActivityInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "140", children: [" ", _jsx(_components.span, { className: "token function", children: "clearInterval" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "userActivityInterval", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "141", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "142", children: [" ", _jsx(_components.span, { className: "token function", children: "setConnectionState" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'disconnected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "143", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "144", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "onlineUsers", _jsx(_components.span, { className: "token punctuation", children: "]" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "145", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "146", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleSendMessage" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "147", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token operator", children: "!" }), "messageInput", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " connectionState ", _jsx(_components.span, { className: "token operator", children: "!==" }), " ", _jsx(_components.span, { className: "token string", children: "'connected'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "148", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "149", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "150", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "151", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " newMessage ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "152", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "id" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "now" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "+" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "Math" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function 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_jsx(_components.span, { className: "token method function property-access", children: "trim" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "155", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "timestamp" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Date" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, 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[_jsx(_components.span, { className: "token punctuation", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "279", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "280", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "281", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "282", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "ChatApp" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Why we write this React code:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const messagesEndRef = useRef(null)" }), " creates a reference to scroll to the bottom of messages"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const scrollToBottom = () => { ... }" }), " automatically scrolls to show new messages"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useEffect(() => { scrollToBottom(); }, [messages])" }), " triggers scroll when messages update"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const [onlineUsers, setOnlineUsers] = useState([...])" }), " tracks who's currently online"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const simulateUserActivity = () => { ... }" }), " simulates users joining and leaving the chat"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setOnlineUsers(prev => [...prev, newUser])" }), " adds users to the online list"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setOnlineUsers(prev => prev.filter(user => user !== userToRemove))" }), " removes users from online list"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "

" }), " provides a target for auto-scrolling"] }), "\n", _jsx(_components.li, { children: "The online users display shows real-time presence information" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates advanced real-time patterns including auto-scrolling, user presence tracking, and comprehensive connection lifecycle management."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to experience the complete professional chat application! You'll see auto-scrolling, online user lists, and all the real-time features working together."] }), "\n", _jsx(_components.h2, { children: "Congratulations!" }), "\n", _jsx(_components.p, { children: "You've successfully built your first real-time React application with WebSocket integration! You've applied fundamental concepts that power every modern, real-time web application:" }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "React Concepts Mastered:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Real-Time Communication" }), ": Implemented WebSocket patterns for instant, bidirectional communication"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Connection State Management" }), ": Coordinated multiple connection states for excellent user experience"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "useEffect for Lifecycle Management" }), ": Used React hooks to handle persistent connections and cleanup"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Real-Time State Updates" }), ": Managed unpredictable, live data updates from external sources"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Optimistic Updates" }), ": Provided immediate user feedback while handling server communication"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Error Handling and Recovery" }), ": Implemented robust error handling with automatic and manual recovery"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Professional UI Patterns" }), ": Created responsive real-time interfaces with immediate visual feedback"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Real-World Applications:" }) }), "\n", _jsx(_components.p, { children: "This chat application demonstrates patterns you'll use in every real-time React application:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Communication Platforms" }), ": Building chat systems like Slack, Discord, or Microsoft Teams"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Collaborative Tools" }), ": Creating real-time editing experiences like Google Docs or Figma"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Live Dashboards" }), ": Developing monitoring systems with real-time data updates"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Gaming Applications" }), ": Building multiplayer games with synchronized state"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Financial Applications" }), ": Creating trading platforms with live market data"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Social Media" }), ": Implementing live comments, notifications, and activity feeds"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "What You've Built:" }) }), "\n", _jsx(_components.p, { children: "Your chat application showcases React's real-time capabilities:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Instant Communication" }), ": Messages appear immediately for all users"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Connection Awareness" }), ": Clear visual feedback about connection status"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Error Resilience" }), ": Graceful handling of connection issues with recovery options"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Professional Quality" }), ": Smooth animations, auto-scrolling, and polished user experience"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Scalable Architecture" }), ": Patterns that work for simple chats or complex collaborative applications"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Professional Development Patterns:" }) }), "\n", _jsx(_components.p, { children: "You've learned industry-standard React practices:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Connection Lifecycle Management" }), ": Professional patterns for establishing, maintaining, and cleaning up connections"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Real-Time State Coordination" }), ": Managing multiple state variables that update from external sources"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "User Experience Focus" }), ": Providing immediate feedback, clear status indicators, and error recovery"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Component Architecture" }), ": Clean separation of concerns with focused, reusable components"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Technical Achievements:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Simulated WebSocket Integration" }), ": Learned real-time patterns that work identically with actual WebSocket servers"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Multi-State Coordination" }), ": Successfully managed connection, message, error, and user presence states"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Event-Driven Architecture" }), ": Handled both user-initiated actions and system-generated events"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Performance Optimization" }), ": Implemented auto-scrolling, cleanup functions, and efficient state updates"] }), "\n"] }), "\n", _jsx(_components.p, { children: "You're now ready to integrate real WebSocket servers with React applications! The patterns you've learned - connection management, real-time state updates, error handling, and user experience design - are the foundation for building sophisticated, collaborative React applications." }), "\n", _jsx(_components.p, { children: "Every professional React developer working on modern applications uses these exact real-time patterns. You've mastered the fundamentals that power everything from simple chat systems to complex collaborative platforms with millions of users." }), "\n", _jsx(_components.p, { children: "Your journey into real-time React development is complete!" }), "\n", _jsx(_components.pre, { children: _jsx(_components.code, { className: "code-highlight" }) })] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };