"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: Hooks for Data Fetching" }), "\n", _jsx(_components.p, { children: "Follow these step-by-step instructions to build your first data fetching custom hook and see it power three different components. This exercise will reinforce the data fetching concepts you learned in the lesson and guide you through creating professional-grade async operations that handle loading states, error handling, and cleanup logic." }), "\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: "Custom Hook with useEffect" }), ": You'll create your first data fetching hook (", _jsx(_components.code, { children: "useFetch" }), ") that uses ", _jsx(_components.code, { children: "useEffect" }), " to handle side effects and async operations. This demonstrates how React allows you to encapsulate complex async logic into reusable functions."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Async State Management" }), ": You'll manage three coordinated states (data, loading, error) that work together to provide a complete data fetching experience. This shows how professional React applications handle the complexity of async operations."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Request Cancellation and Cleanup" }), ": You'll implement ", _jsx(_components.code, { children: "AbortController" }), " to cancel pending requests when components unmount, preventing memory leaks and demonstrating professional React patterns for cleanup logic."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Error Handling Patterns" }), ": You'll create user-friendly error handling that converts technical errors into meaningful messages, showing how React applications provide excellent user experiences even when things go wrong."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Hook Reusability" }), ": You'll see how the same ", _jsx(_components.code, { children: "useFetch" }), " hook can power completely different user interfaces - user profiles, weather data, and quote displays - demonstrating the power of separating logic from presentation."] }), "\n", _jsx(_components.h2, { children: "The Challenge" }), "\n", _jsxs(_components.p, { children: ["Create a versatile ", _jsx(_components.code, { children: "useFetch" }), " custom hook and demonstrate its power by using it in three different components:"] }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "User Profile" }), " component that generates and displays user information with skeleton loading states"] }), "\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "Random Number Generator" }), " component that creates random numbers with error handling and retry functionality"] }), "\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "Color Palette Generator" }), " component that generates beautiful color palettes with refresh capabilities"] }), "\n"] }), "\n", _jsxs(_components.p, { children: ["Each component will use the exact same ", _jsx(_components.code, { children: "useFetch" }), " hook but create completely different user experiences, showcasing the reusability and power of custom data fetching hooks with simulated loading and mock data."] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Success Criteria:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.code, { children: "useFetch" }), " custom hook manages data, loading, and error states automatically"] }), "\n", _jsxs(_components.li, { children: ["✅ Hook includes request cancellation with ", _jsx(_components.code, { children: "AbortController" }), " for cleanup"] }), "\n", _jsx(_components.li, { children: "✅ User Profile Card shows skeleton loading states and user information" }), "\n", _jsx(_components.li, { children: "✅ Weather Widget includes retry functionality and refresh capabilities" }), "\n", _jsx(_components.li, { children: "✅ Quote Display allows users to fetch new quotes on demand" }), "\n", _jsx(_components.li, { children: "✅ All components use the same hook but create different experiences" }), "\n", _jsx(_components.li, { children: "✅ Components are organized in separate files with proper imports" }), "\n", _jsx(_components.li, { children: "✅ Professional error handling with user-friendly messages" }), "\n", _jsx(_components.li, { children: "✅ Smooth loading states and professional styling" }), "\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 data fetching system 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", _jsxs(_components.li, { children: ["Custom hook creation with ", _jsx(_components.code, { children: "useEffect" }), " for side effects"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useState" }), " for managing data, loading, and error states"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useCallback" }), " for memoizing functions and preventing re-renders"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "AbortController" }), " for request cancellation and cleanup"] }), "\n", _jsx(_components.li, { children: "Async/await patterns within React hooks" }), "\n", _jsx(_components.li, { children: "Component import/export with ES6 modules" }), "\n", _jsx(_components.li, { children: "Conditional rendering for different UI states" }), "\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 states every data fetching operation needs (data, loading, error)" }), "\n", _jsx(_components.li, { children: "Consider how to handle the three phases of async operations (pending, fulfilled, rejected)" }), "\n", _jsxs(_components.li, { children: ["Remember that ", _jsx(_components.code, { children: "useEffect" }), " cleanup functions prevent memory leaks"] }), "\n", _jsx(_components.li, { children: "Use descriptive names for your hook and its returned values" }), "\n", _jsx(_components.li, { children: "Each component should focus on its specific UI while using the shared data fetching logic" }), "\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 useFetch Custom Hook" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "useFetch.js" }), " and implement your first data fetching hook. This demonstrates React's most important patterns for async operations with simulated loading and mock data that works reliably in any environment."] }), "\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 punctuation", children: "{" }), " useState", _jsx(_components.span, { className: "token punctuation", children: "," }), " useEffect", _jsx(_components.span, { className: "token punctuation", children: "," }), " useCallback ", _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 comment", children: "// Mock data generators" }), "\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 function-variable function", children: "generateMockUser" }), " ", _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: "=>" }), " 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className: "token function", children: "setError" }), _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: "76", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "77", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate network delay" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "78", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "await" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Promise" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "resolve" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "79", children: [" ", _jsx(_components.span, { className: "token function", children: "setTimeout" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "resolve", _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "800" }), " ", _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: "1200" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "80", 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: "81", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "82", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Simulate occasional errors for random numbers" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "83", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "dataType ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'random-number'" }), " ", _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: "0.15" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "84", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "throw" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Error" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "85", children: [" ", _jsx(_components.span, { className: "token string", children: "'Failed to generate random number. Please try again!'" }), "\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"] }), _jsxs(_components.span, { className: "code-line line-number", line: "87", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "88", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "89", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Generate mock data based on type" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "90", children: [" ", _jsx(_components.span, { className: "token keyword", children: "let" }), " mockData", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "91", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "switch" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "dataType", _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "92", children: [" ", _jsx(_components.span, { className: "token keyword", children: "case" }), " ", _jsx(_components.span, { className: "token string", children: "'user'" }), _jsx(_components.span, { className: "token operator", children: ":" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "93", children: [" mockData ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "generateMockUser" }), _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 keyword control-flow", children: "break" }), _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", children: "case" }), " ", _jsx(_components.span, { className: "token string", children: "'random-number'" }), _jsx(_components.span, { className: "token operator", children: ":" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "96", children: [" mockData ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "generateRandomNumber" }), _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: "97", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "break" }), _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", children: "case" }), " ", _jsx(_components.span, { className: "token string", children: "'color-palette'" }), _jsx(_components.span, { className: "token operator", children: ":" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "99", children: [" mockData ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "generateColorPalette" }), _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: "100", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "break" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "101", children: [" ", _jsx(_components.span, { className: "token keyword module", children: "default" }), _jsx(_components.span, { className: "token operator", children: ":" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "102", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "throw" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Error" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'Unknown data type'" }), _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: "}" }), "\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 function", children: "setData" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "mockData", _jsx(_components.span, { className: "token punctuation", 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 punctuation", children: "}" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "catch" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "err", _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 function", children: "setError" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "err", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "message" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "108", children: [" ", _jsx(_components.span, { className: "token function", children: "setData" }), _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: "109", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "finally" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "110", children: [" ", _jsx(_components.span, { className: "token function", children: "setLoading" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token boolean", children: "false" }), _jsx(_components.span, { className: "token punctuation", 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 punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "112", 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: "113", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "114", children: [" ", _jsx(_components.span, { className: "token function", children: "fetchData" }), _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 punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "dataType", _jsx(_components.span, { className: "token punctuation", children: "," }), " refreshTrigger", _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: "116", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "117", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " refetch ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useCallback" }), _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: "118", children: [" ", _jsx(_components.span, { className: "token function", children: "setRefreshTrigger" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "prev" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " prev ", _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 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: "120", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "121", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " data", _jsx(_components.span, { className: "token punctuation", children: "," }), " loading", _jsx(_components.span, { className: "token punctuation", children: "," }), " error", _jsx(_components.span, { className: "token punctuation", children: "," }), " refetch ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _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: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "123", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "124", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " useFetch", _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: "useState" }), " creates three coordinated states plus a refresh trigger for complete async operation management"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useEffect" }), " handles simulated data fetching when the component mounts or refresh trigger changes"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "setTimeout" }), " simulates realistic network delays that work reliably in any environment"] }), "\n", _jsx(_components.li, { children: "Mock data generators create realistic, varied content for each component type" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "refreshTrigger" }), " state enables proper refetch functionality by triggering useEffect re-runs"] }), "\n", _jsx(_components.li, { children: "Simulated errors (15% chance for random numbers) demonstrate error handling patterns" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates custom hook creation with simulated async operations - teaching the same patterns as real API calls but with reliable, predictable behavior that works in any environment."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your data fetching hook created! The hook is now ready to be used by any component that needs simulated data fetching."] }), "\n", _jsx(_components.h3, { children: "Step 2: Create the User Profile Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "UserProfile.js" }), " and build a component that uses your custom hook to display generated user information with professional loading states."] }), "\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" }), " ", _jsx(_components.span, { className: "token imports", children: _jsx(_components.span, { className: "token maybe-class-name", children: "React" }) }), " ", _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"] }), _jsxs(_components.span, { className: "code-line line-number", line: "2", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token imports", children: "useFetch" }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'./useFetch'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token string", children: "'./UserProfile.css'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "4", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "5", 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: "UserProfile" }) }), _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: "6", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token literal-property property", children: 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[_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: "\"" }), "detail-item", _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: "54", 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: "<" }), "strong"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "Phone:" }), _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: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "user", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "phone" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, 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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: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "user", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "website" }), _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: "58", 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: "" })] 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children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "60", 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: "<" }), "strong"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "Company:" }), _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: " " }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "user", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "company" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "name" }), _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: "61", 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: "62", 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: "63", 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: "64", 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: "65", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "66", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "67", 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: "UserProfile" }), _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 useFetch from './useFetch'" }), " imports our custom data fetching hook"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "const { data: user, loading, error } = useFetch('user')" }), " uses the hook with a data type parameter"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useFetch('user')" }), " triggers the mock user data generation with simulated loading"] }), "\n", _jsx(_components.li, { children: "Multiple conditional renders handle all possible states: loading, error, empty, and success" }), "\n", _jsx(_components.li, { children: "Skeleton loading states provide professional user experience during simulated data fetching" }), "\n", _jsx(_components.li, { children: "Component focuses purely on UI presentation while the hook handles all data generation logic" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This shows how custom hooks separate concerns - the component handles UI rendering while the hook manages all the complex async logic, loading states, and mock data generation."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your user profile component! Notice how the custom hook automatically handles the loading state, generates realistic user data, and provides error handling."] }), "\n", _jsx(_components.h3, { children: "Step 3: Create the Random Number Generator Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "RandomNumber.js" }), " and build a component that demonstrates error handling and retry functionality using the same hook."] }), "\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" }), " ", _jsx(_components.span, { className: "token imports", children: _jsx(_components.span, { className: "token maybe-class-name", children: "React" }) }), " ", _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"] }), _jsxs(_components.span, { className: "code-line line-number", line: "2", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token imports", children: "useFetch" }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'./useFetch'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token string", children: "'./RandomNumber.css'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "4", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "5", 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: "RandomNumber" }) }), _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: "6", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "data" }), _jsx(_components.span, { className: "token operator", children: ":" }), " numberData", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [" loading", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [" error", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [" refetch", _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: "}" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useFetch" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'random-number'" }), _jsx(_components.span, { className: "token punctuation", 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 control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "loading", _jsx(_components.span, { className: "token punctuation", 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 keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "15", 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: "\"" }), "random-number loading", _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: "16", 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: "\"" }), "number-skeleton", _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: "17", 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: "\"" }), "skeleton-number", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", 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: "18", 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: "19", 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: "<" }), "p"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "Generating random number..." }), _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: "20", 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: "21", children: [" 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"generate-button", _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: "53", children: _jsx(_components.span, { className: "token plain-text", children: " Generate New Number\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "54", 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: "55", 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: "56", 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: "57", 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 keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "RandomNumber" }), _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: ["Same ", _jsx(_components.code, { children: "useFetch" }), " hook but with different destructuring: ", _jsx(_components.code, { children: "{ data: numberData, loading, error, refetch }" })] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useFetch('random-number')" }), " triggers random number generation with simulated loading"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "refetch" }), " function allows users to generate new numbers on demand"] }), "\n", _jsxs(_components.li, { children: ["Error state includes a retry button that calls ", _jsx(_components.code, { children: "refetch" }), " for error recovery (15% chance of errors)"] }), "\n", _jsx(_components.li, { children: "Timestamp shows when each number was generated, demonstrating dynamic content" }), "\n", _jsx(_components.li, { children: "Large number display provides immediate visual feedback" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates how the same custom hook can power completely different UI patterns - the data fetching logic is identical, but the presentation focuses on numeric data with interactive generation."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to test your random number generator! Try generating new numbers to see how the same hook handles repeated data generation and occasional error handling."] }), "\n", _jsx(_components.h3, { children: "Step 4: Create the Color Palette Generator Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "ColorPalette.js" }), " and build a component that showcases visual content generation with the same hook."] }), "\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" }), " ", _jsx(_components.span, { className: "token imports", children: _jsx(_components.span, { className: "token maybe-class-name", children: "React" }) }), " ", _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"] }), _jsxs(_components.span, { className: "code-line line-number", line: "2", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token imports", children: "useFetch" }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'./useFetch'" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [_jsx(_components.span, { className: "token keyword module", children: "import" }), " ", _jsx(_components.span, { className: "token string", children: "'./ColorPalette.css'" }), _jsx(_components.span, { className: "token punctuation", children: ";" 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line-number", line: "35", 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: "<" }), "p"] }), _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: "36", children: _jsx(_components.span, { className: "token plain-text", children: " Each component uses the same useFetch custom hook but\n" }) }), _jsx(_components.span, { className: "code-line line-number", line: "37", children: _jsx(_components.span, { className: "token plain-text", children: " creates completely different user experiences with simulated\n" }) }), _jsx(_components.span, { className: "code-line line-number", line: "38", children: _jsx(_components.span, { className: "token plain-text", children: " loading, error handling, and interactive refresh!\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "39", 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: "40", 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: "41", 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: "42", 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: "43", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "44", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "45", 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" }), " statements bring in all three components that use the same custom hook"] }), "\n", _jsx(_components.li, { children: "Grid layout showcases how the same hook powers different data-driven UI patterns" }), "\n", _jsx(_components.li, { children: "Each component demonstrates different aspects: user data, random numbers, visual colors" }), "\n", _jsx(_components.li, { children: "No props needed since all data is generated by the hook internally" }), "\n", _jsx(_components.li, { children: "Clear sections help users understand that one hook powers multiple experiences" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates component composition and how custom hooks enable consistent data fetching behavior across diverse UI patterns in a single application."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete data fetching demonstration! All three components use the same ", _jsx(_components.code, { children: "useFetch" }), " logic but create entirely different user experiences."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Test your application!" }), " Try generating new numbers, creating new color palettes, and observe the loading states to see how the same custom hook logic powers completely different user experiences with reliable functionality and engaging interactions."] }), "\n", _jsx(_components.h2, { children: "Congratulations!" }), "\n", _jsx(_components.p, { children: "You've successfully built your first data fetching custom hook and demonstrated its power across multiple components! You've applied fundamental React concepts for professional async operations:" }), "\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: "Custom Hook with useEffect" }), ": Built a reusable ", _jsx(_components.code, { children: "useFetch" }), " hook that handles side effects and async operations"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Async State Management" }), ": Coordinated data, loading, and error states for complete user experiences"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Request Cancellation" }), ": Implemented ", _jsx(_components.code, { children: "AbortController" }), " for cleanup and memory leak prevention"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Professional Error Handling" }), ": Created user-friendly error messages and recovery mechanisms"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Hook Reusability" }), ": Used the same hook across different components and data types"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Component Architecture" }), ": Organized code in separate files with proper imports and exports"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Real-World Applications:" }) }), "\n", _jsx(_components.p, { children: "This data fetching pattern demonstrates techniques you'll use in every React application:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "E-commerce" }), ": Product data, user profiles, shopping cart synchronization, inventory updates"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Social Media" }), ": User feeds, profile information, real-time updates, notification systems"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Dashboard Applications" }), ": Analytics data, user metrics, system status, performance monitoring"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Content Management" }), ": Article data, media information, user-generated content, search results"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Financial Applications" }), ": Account data, transaction history, market information, real-time prices"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "What You've Built:" }) }), "\n", _jsx(_components.p, { children: "Your data fetching system showcases React's core strengths for async operations:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Consistent Behavior" }), ": All data fetching behaves identically across the application"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Error Recovery" }), ": Users can retry failed requests and get clear feedback about problems"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Professional Loading States" }), ": Skeleton screens and loading indicators provide excellent UX"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Memory Management" }), ": Request cancellation prevents leaks and improves performance"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Code Reusability" }), ": One hook powers multiple different data-driven user interfaces"] }), "\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 for data fetching:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Separation of Concerns" }), ": Data logic is separate from UI presentation"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Error Boundaries" }), ": Graceful error handling that doesn't crash the application"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Performance Optimization" }), ": Request cancellation and proper cleanup prevent memory issues"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "User Experience" }), ": Loading states and error recovery create professional applications"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Scalable Architecture" }), ": Patterns that work for simple demos and complex applications"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Advanced Concepts You're Ready For:" }) }), "\n", _jsx(_components.p, { children: "Now that you've mastered basic data fetching hooks, you're prepared for:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Caching and Performance" }), ": Implementing request caching and deduplication"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Real-time Data" }), ": WebSocket integration and live data updates"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Complex State Management" }), ": Integration with Redux, Zustand, or other state libraries"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Form Handling" }), ": Custom hooks for form validation and submission"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Local Storage" }), ": Persistent state management with custom hooks"] }), "\n"] }), "\n", _jsx(_components.p, { children: "You're now ready to create custom hooks for any data fetching scenario in your React applications. Every React concept you'll learn builds on these data fetching fundamentals you've just mastered!" }), "\n", _jsx(_components.p, { children: "The power of data fetching hooks lies not just in code reuse, but in creating a consistent, reliable foundation for all async operations in your applications. This makes your entire development process more productive and your applications more maintainable." }), "\n", _jsxs(_components.p, { children: ["Professional React development starts with mastering patterns like the ", _jsx(_components.code, { children: "useFetch" }), " hook you've just built. You're well on your way to building production-ready React applications!"] })] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };