"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: Advanced Hook Patterns" }), "\n", _jsxs(_components.p, { children: ["Follow these step-by-step instructions to build an advanced custom hook using ", _jsx(_components.code, { children: "useReducer" }), ", ", _jsx(_components.code, { children: "useEffect" }), ", and hook composition patterns. This exercise will reinforce the sophisticated React concepts you learned in the lesson and guide you through creating professional-grade reusable 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: "useReducer for Complex State" }), ": You'll use ", _jsx(_components.code, { children: "useReducer" }), " instead of multiple ", _jsx(_components.code, { children: "useState" }), " calls to manage complex, coordinated state with predictable transitions. This demonstrates how React provides tools for sophisticated state management."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "State Machine Design" }), ": You'll design a reducer that handles all possible localStorage operations (loading, success, error, clear) through well-defined actions, showing how to create predictable state transitions."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Hook Composition" }), ": You'll combine ", _jsx(_components.code, { children: "useReducer" }), ", ", _jsx(_components.code, { children: "useEffect" }), ", and ", _jsx(_components.code, { children: "useCallback" }), " to create a sophisticated custom hook that handles multiple concerns while maintaining clean separation of responsibilities."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Side Effect Management" }), ": You'll use multiple ", _jsx(_components.code, { children: "useEffect" }), " hooks for different purposes (initial data loading, cross-tab synchronization, cleanup), demonstrating advanced lifecycle management."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Professional Error Handling" }), ": You'll implement comprehensive error handling that gracefully degrades when localStorage fails, showing how to create robust applications."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Performance Optimization" }), ": You'll use ", _jsx(_components.code, { children: "useCallback" }), " and proper dependency management to ensure your advanced hook performs well in production applications."] }), "\n", _jsx(_components.h2, { children: "The Challenge" }), "\n", _jsxs(_components.p, { children: ["Create a sophisticated ", _jsx(_components.code, { children: "useLocalStorage" }), " custom hook that demonstrates advanced React patterns and use it in three different components:"] }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "Settings Panel" }), " that persists user preferences across browser sessions"] }), "\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "Shopping Cart" }), " that maintains items even after browser restarts"] }), "\n", _jsxs(_components.li, { children: ["A ", _jsx(_components.strong, { children: "Note Taker" }), " that auto-saves content and syncs across browser tabs"] }), "\n"] }), "\n", _jsxs(_components.p, { children: ["Each component will use the same advanced ", _jsx(_components.code, { children: "useLocalStorage" }), " hook but handle different data types and user interactions, showcasing the power of sophisticated, reusable logic."] }), "\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: "useLocalStorage" }), " hook uses ", _jsx(_components.code, { children: "useReducer" }), " for complex state management"] }), "\n", _jsx(_components.li, { children: "✅ Hook handles loading, data, error, and initialized states coordinately" }), "\n", _jsx(_components.li, { children: "✅ Settings panel persists user preferences with object state management" }), "\n", _jsx(_components.li, { children: "✅ Shopping cart maintains items with array state and complex updates" }), "\n", _jsx(_components.li, { children: "✅ Note taker auto-saves content with string state and real-time updates" }), "\n", _jsx(_components.li, { children: "✅ All components handle loading states and errors gracefully" }), "\n", _jsx(_components.li, { children: "✅ Cross-tab synchronization works when localStorage changes in other tabs" }), "\n", _jsx(_components.li, { children: "✅ Components are organized in separate files with proper imports" }), "\n", _jsx(_components.li, { children: "✅ Professional styling with smooth loading states and error handling" }), "\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 advanced hook 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: [_jsx(_components.code, { children: "useReducer" }), " for managing complex, coordinated state"] }), "\n", _jsxs(_components.li, { children: ["Multiple ", _jsx(_components.code, { children: "useEffect" }), " hooks for different side effects and lifecycle concerns"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useCallback" }), " for performance optimization and function memoization"] }), "\n", _jsx(_components.li, { children: "Custom hook creation with advanced patterns and error handling" }), "\n", _jsx(_components.li, { children: "Component import/export with ES6 modules" }), "\n", _jsx(_components.li, { children: "Functional state updates and immutable state patterns" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Conceptual Hints:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Think about all the states localStorage operations can be in (loading, success, error)" }), "\n", _jsx(_components.li, { children: "Consider how to coordinate multiple related state values through a single reducer" }), "\n", _jsx(_components.li, { children: "Remember that localStorage operations can fail and need error handling" }), "\n", _jsxs(_components.li, { children: ["Use multiple ", _jsx(_components.code, { children: "useEffect" }), " hooks for different concerns (reading, listening, cleanup)"] }), "\n", _jsx(_components.li, { children: "Each component should focus on its specific UI while using the shared advanced 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 advanced 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 advanced React concept in detail, follow these steps:" }), "\n", _jsx(_components.h3, { children: "Step 1: Create the useLocalStorage Custom Hook with useReducer" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "useLocalStorage.js" }), " and implement the advanced custom hook. This demonstrates React's ", _jsx(_components.code, { children: "useReducer" }), " pattern for complex state management."] }), "\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: "{" }), " useReducer", _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: "// Define all possible states and actions for localStorage operations" }), "\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: "localStorageReducer" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsxs(_components.span, { className: "token parameter", children: ["state", _jsx(_components.span, { className: "token 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className: "code-line line-number", line: "48", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "initialized" }), _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: "49", 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: "50", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "51", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token spread operator", children: "..." }), "state ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _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: "}" }), "\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 keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " useLocalStorage", _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: "localStorageReducer" }), " defines all possible state transitions for localStorage operations"] }), "\n", _jsxs(_components.li, { children: ["Each ", _jsx(_components.code, { children: "action.type" }), " represents a different outcome (loading, success, error, clear)"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useReducer(localStorageReducer, initialState)" }), " manages complex state coordination"] }), "\n", _jsx(_components.li, { children: "The reducer ensures state updates are predictable and atomic" }), "\n", _jsx(_components.li, { children: "Initial state includes all necessary properties for localStorage operations" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates ", _jsx(_components.code, { children: "useReducer" }), " for complex state management - instead of multiple ", _jsx(_components.code, { children: "useState" }), " calls, we use a single reducer to coordinate related state values predictably."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your advanced custom hook foundation! The reducer pattern provides the structure for sophisticated state management."] }), "\n", _jsx(_components.h3, { children: "Step 2: Add localStorage Reading with useEffect" }), "\n", _jsxs(_components.p, { children: ["Update your ", _jsx(_components.code, { children: "useLocalStorage.js" }), " file to add initial data loading functionality using ", _jsx(_components.code, { children: "useEffect" }), " for side effects."] }), "\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", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: "useLocalStorage" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsxs(_components.span, { className: "token parameter", children: ["key", _jsx(_components.span, { className: "token punctuation", children: "," }), " defaultValue"] }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _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", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "state", _jsx(_components.span, { className: "token punctuation", children: "," }), " dispatch", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useReducer" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "localStorageReducer", _jsx(_components.span, { className: "token punctuation", 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 literal-property property", children: "data" }), _jsx(_components.span, { className: "token operator", children: ":" }), " defaultValue", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "loading" }), _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: "5", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "error" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "initialized" }), _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: "7", 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: "8", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Read from localStorage on mount" }), "\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: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "readFromStorage" }), " ", _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: "12", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "try" }), " ", _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: "dispatch" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token literal-property property", children: "type" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'LOADING'" }), " ", _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: "14", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "15", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " storedValue ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token dom variable", children: "localStorage" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "getItem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "key", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "16", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "17", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "storedValue ", _jsx(_components.span, { className: "token operator", 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: "18", children: [" ", _jsx(_components.span, { className: "token comment", children: "// No stored value, use default" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "19", children: [" ", _jsx(_components.span, { className: "token function", children: "dispatch" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token literal-property property", children: "type" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'SUCCESS'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token literal-property property", children: "payload" }), _jsx(_components.span, { className: "token operator", children: ":" }), " defaultValue ", _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: "20", 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: "21", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Parse stored value" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "22", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " parsedValue ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token known-class-name class-name", children: "JSON" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "parse" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "storedValue", _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: "dispatch" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token literal-property property", children: "type" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'SUCCESS'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token literal-property property", children: "payload" }), _jsx(_components.span, { className: "token operator", children: ":" }), " parsedValue ", _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: "24", 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 punctuation", children: "}" }), " ", _jsx(_components.span, { className: "token keyword control-flow", children: "catch" }), " ", _jsx(_components.span, { className: "token punctuation", 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: "26", children: [" ", _jsx(_components.span, { className: "token console class-name", children: "console" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "error" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'Error reading from localStorage:'" }), _jsx(_components.span, { className: "token punctuation", 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: "27", children: [" ", _jsx(_components.span, { className: "token function", children: "dispatch" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "28", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "type" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'ERROR'" }), _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: "payload" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'Failed to read stored data'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "30", 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: "31", 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 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 function", children: "readFromStorage" }), _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: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "key", _jsx(_components.span, { className: "token punctuation", children: "," }), " defaultValue", _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: "36", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "37", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " ", _jsx(_components.span, { className: "token spread operator", children: "..." }), "state ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _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: "}" }), "\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: "useEffect(() => {}, [key, defaultValue])" }), " runs when component mounts or dependencies change"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "dispatch({ type: 'LOADING' })" }), " updates state through the reducer to show loading"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "localStorage.getItem(key)" }), " reads data from browser storage"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "JSON.parse(storedValue)" }), " safely converts stored strings back to JavaScript objects"] }), "\n", _jsx(_components.li, { children: "Try/catch handles parsing errors and storage access failures" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This shows advanced ", _jsx(_components.code, { children: "useEffect" }), " usage for side effects - reading from external storage when the component mounts, with proper error handling and state coordination through the reducer."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to test your localStorage reading! The hook now loads initial data and handles errors gracefully."] }), "\n", _jsx(_components.h3, { children: "Step 3: Add Data Writing and Cross-Tab Synchronization" }), "\n", _jsxs(_components.p, { children: ["Update your ", _jsx(_components.code, { children: "useLocalStorage.js" }), " file to add data writing functionality and cross-tab synchronization."] }), "\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", children: "function" }), " ", _jsx(_components.span, { className: "token function", children: "useLocalStorage" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsxs(_components.span, { className: "token parameter", children: ["key", _jsx(_components.span, { className: "token punctuation", children: "," }), " defaultValue"] }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _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", children: "const" }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "state", _jsx(_components.span, { className: "token punctuation", children: "," }), " dispatch", _jsx(_components.span, { className: "token punctuation", children: "]" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useReducer" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "localStorageReducer", _jsx(_components.span, { className: "token punctuation", 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 literal-property property", children: "data" }), _jsx(_components.span, { className: "token operator", children: ":" }), " defaultValue", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "loading" }), _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: "5", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "error" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token keyword null nil", children: "null" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "initialized" }), _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: "7", 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: "8", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Read from localStorage on mount" }), "\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 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_jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "39", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "40", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " valueToStore ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "41", children: [" ", _jsx(_components.span, { className: "token keyword", children: "typeof" }), " newValue ", _jsx(_components.span, { className: "token operator", children: "===" }), " ", _jsx(_components.span, { className: "token string", children: "'function'" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "42", children: [" ", _jsx(_components.span, { className: "token operator", children: "?" }), " ", _jsx(_components.span, { className: "token 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_jsxs(_components.span, { className: "code-line line-number", line: "84", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token punctuation", children: "[" }), "key", _jsx(_components.span, { className: "token punctuation", children: "," }), " defaultValue", _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: "85", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "86", children: [" ", _jsx(_components.span, { className: "token comment", children: "// Listen for storage changes from other tabs" }), "\n"] }), _jsxs(_components.span, { className: 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", _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 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: "clearData" }), " removes data from localStorage and resets to default value"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "resetData" }), " explicitly sets localStorage back to the default value"] }), "\n", _jsxs(_components.li, { children: ["All functions use ", _jsx(_components.code, { children: "useCallback" }), " for consistent performance optimization"] }), "\n", _jsx(_components.li, { children: "Complete interface provides all necessary localStorage operations" }), "\n", _jsx(_components.li, { children: "Error handling ensures the hook works even when storage operations fail" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates complete advanced hook design - multiple concerns (reading, writing, clearing, listening) coordinated through a single, sophisticated interface."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete advanced hook! It now handles all localStorage operations with professional error handling."] }), "\n", _jsx(_components.h3, { children: "Step 5: Create the Settings Panel Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "SettingsPanel.js" }), " and build a component that uses your advanced hook for persistent user preferences."] }), "\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 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Notice how changes persist across browser refreshes and handle errors gracefully."] }), "\n", _jsx(_components.h3, { children: "Step 6: Create the Shopping Cart Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "ShoppingCart.js" }), " and build a component that uses the advanced hook for persistent cart data."] }), "\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", 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children: "Why we write this React code:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Same advanced hook but managing array state instead of object state" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "addItem" }), " uses complex functional updates to handle existing vs new items"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "prevItems.find()" }), " and ", _jsx(_components.code, { children: "prevItems.map()" }), " demonstrate immutable array operations"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "getTotalPrice()" }), " calculates derived state from the cart items"] }), "\n", _jsx(_components.li, { children: "Conditional rendering handles empty cart, loading, and error states" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates how the same advanced hook handles different data types - the localStorage complexity is hidden while the component focuses on cart-specific logic."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to test your shopping cart! Add items, refresh the browser, and see how they persist across sessions."] }), "\n", _jsx(_components.h3, { children: "Step 7: Create the Note Taker Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "NoteTaker.js" }), " and build a component that uses the advanced hook for auto-saving text content."] }), "\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: "{" }), " 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punctuation", 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: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "65", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "66", 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: "NoteTaker" }), _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", _jsx(_components.li, { children: "Same advanced hook managing string state with real-time updates" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "handleTextChange" }), " updates both the note content and last saved timestamp"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useState" }), " for local component state (lastSaved) that doesn't need persistence"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "onChange={handleTextChange}" }), " provides auto-save functionality on every keystroke"] }), "\n", _jsx(_components.li, { children: "Character count and save timestamp provide user feedback" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This shows how advanced hooks can handle real-time updates - every keystroke automatically saves to localStorage while providing immediate user feedback."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to test your note taker! Type some text, refresh the browser, and see how your notes persist automatically."] }), "\n", _jsx(_components.h3, { children: "Step 8: Update the App Component" }), "\n", _jsxs(_components.p, { children: ["Now update your ", _jsx(_components.code, { children: "App.js" }), " file to import and use all three components, showcasing how the same advanced hook powers different experiences."] }), "\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: _jsx(_components.span, { className: "token maybe-class-name", children: "SettingsPanel" }) }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'./SettingsPanel'" }), _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 imports", children: _jsx(_components.span, { className: "token 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"token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", 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: "<" }), "header"] }), " ", _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-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: "11", 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: "Advanced Hook Patterns" }), _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: "12", 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: "One useLocalStorage hook, three sophisticated experiences" }), _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: "13", 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: "14", children: _jsx(_components.span, { className: "token plain-text", children: "\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "15", 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: "<" }), "main"] }), " ", _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-main", _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: "\"" }), "components-grid", _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: "<" }), _jsx(_components.span, { className: "token class-name", children: "SettingsPanel" })] }), " ", _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 class-name", children: "ShoppingCart" })] }), " ", _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: "<" }), _jsx(_components.span, { className: "token class-name", children: "NoteTaker" })] }), " ", _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: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "21", 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: "22", children: _jsx(_components.span, { className: "token plain-text", children: "\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "23", 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: "<" }), "footer"] }), " ", _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-footer", _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: "24", 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: "25", children: _jsx(_components.span, { className: "token plain-text", children: " Each component uses the same useLocalStorage custom hook\n" }) }), _jsx(_components.span, { className: "code-line line-number", line: "26", children: _jsx(_components.span, { className: "token plain-text", children: " with useReducer, useEffect, and advanced error handling!\n" }) }), _jsxs(_components.span, { className: "code-line line-number", line: "27", 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: "28", 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: "29", 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: "30", 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: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "32", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "33", 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 using the advanced hook"] }), "\n", _jsx(_components.li, { children: "Layout showcases how the same sophisticated hook powers different data types" }), "\n", _jsx(_components.li, { children: "Each component demonstrates different aspects of advanced state management" }), "\n", _jsx(_components.li, { children: "Grid layout makes it easy to compare the different implementations" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates how advanced custom hooks enable consistent, sophisticated behavior across diverse UI patterns while handling complex state management automatically."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete advanced hook demonstration! All three components use the same sophisticated ", _jsx(_components.code, { children: "useLocalStorage" }), " logic but create entirely different user experiences with persistent data."] }), "\n", _jsx(_components.h2, { children: "Congratulations!" }), "\n", _jsx(_components.p, { children: "You've successfully built an advanced custom hook using professional React patterns! You've applied sophisticated React concepts:" }), "\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: "useReducer Mastery" }), ": Built complex state management with predictable transitions"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Advanced Side Effects" }), ": Used multiple ", _jsx(_components.code, { children: "useEffect" }), " hooks for different concerns"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Hook Composition" }), ": Combined multiple React hooks for sophisticated functionality"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Performance Optimization" }), ": Applied ", _jsx(_components.code, { children: "useCallback" }), " and proper dependency management"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Error Handling" }), ": Implemented comprehensive error handling and graceful degradation"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Professional Patterns" }), ": Followed industry standards for advanced hook design"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Real-World Applications:" }) }), "\n", _jsx(_components.p, { children: "This advanced hook pattern demonstrates techniques you'll use in every professional React application:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "E-commerce" }), ": Persistent shopping carts, user preferences, product favorites"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Productivity Apps" }), ": Auto-saving documents, user settings, workspace configurations"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Social Media" }), ": Draft posts, user preferences, notification settings"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Dashboard Applications" }), ": Widget configurations, filter states, layout preferences"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Content Management" }), ": Draft content, user preferences, editor configurations"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "What You've Built:" }) }), "\n", _jsx(_components.p, { children: "Your advanced hook system showcases React's most sophisticated capabilities:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Complex State Coordination" }), ": Multiple related state values managed through a single reducer"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Professional Error Handling" }), ": Graceful degradation and user-friendly error recovery"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Cross-Tab Synchronization" }), ": Real-time updates across multiple browser tabs"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Performance Optimization" }), ": Memoized functions and efficient state updates"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Data Persistence" }), ": Automatic localStorage integration with JSON serialization"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Professional Development Patterns:" }) }), "\n", _jsx(_components.p, { children: "You've learned expert-level React practices:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "State Machine Design" }), ": Modeling complex state as predictable state machines"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Reducer Patterns" }), ": Centralized state logic with action-based updates"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Side Effect Management" }), ": Multiple ", _jsx(_components.code, { children: "useEffect" }), " hooks with proper cleanup"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Hook Composition" }), ": Building sophisticated functionality from simple, focused parts"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "API Design" }), ": Creating clean, intuitive interfaces for complex functionality"] }), "\n"] }), "\n", _jsx(_components.p, { children: "You're now equipped with the advanced patterns used in professional React libraries and enterprise applications. Every React concept you'll encounter builds on these sophisticated fundamentals you've just mastered!" }), "\n", _jsx(_components.p, { children: "The power of advanced custom hooks lies not just in code reuse, but in creating robust, scalable solutions that handle real-world complexity while maintaining clean, maintainable code that entire development teams can rely on." }), "\n", _jsx(_components.p, { children: "You've successfully transitioned from basic React development to advanced, professional-grade patterns. These are the same techniques used by React experts worldwide to build applications that serve millions of users reliably and efficiently." })] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };