"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", ol: "ol", p: "p", pre: "pre", span: "span", strong: "strong", ul: "ul", ..._provideComponents(), ...props.components }; return _jsxs(_Fragment, { children: [_jsx(_components.h1, { children: "Instructions: useMemo and useCallback" }), "\n", _jsx(_components.p, { children: "Follow these step-by-step instructions to build a professional job search platform using useMemo and useCallback. This exercise will reinforce the React performance concepts you learned in the lesson and guide you through creating a real-world application where you'll apply strategic optimization techniques naturally." }), "\n", _jsx(_components.h2, { children: "Concept Reinforcement" }), "\n", _jsx(_components.p, { children: "Before we start coding, let's review the key React performance concepts you'll be applying in this exercise:" }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "useMemo Optimization" }), ": You'll use useMemo to optimize expensive search and filtering calculations that would otherwise run on every render. This demonstrates how React performance optimization works in real job search applications."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "useCallback Optimization" }), ": You'll use useCallback to create stable function references for event handlers, preventing unnecessary re-renders of child components wrapped with React.memo."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Complete Optimization Strategy" }), ": You'll combine React.memo, useMemo, and useCallback to create a comprehensive performance optimization approach like professional job search platforms."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Real-World Performance" }), ": You'll build a job search platform where filtering hundreds of jobs feels instant and smooth, creating the same user experience as LinkedIn Jobs or Indeed."] }), "\n", _jsx(_components.h2, { children: "The Challenge" }), "\n", _jsx(_components.p, { children: "Create a professional job search platform that demonstrates strategic useMemo and useCallback usage:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Job search interface with real-time filtering across hundreds of job listings" }), "\n", _jsx(_components.li, { children: "Advanced filtering controls (salary range, location, job type, company size)" }), "\n", _jsx(_components.li, { children: "Search results that update instantly without lag" }), "\n", _jsx(_components.li, { children: "Job statistics that calculate efficiently" }), "\n", _jsx(_components.li, { children: "Professional job cards that don't re-render unnecessarily" }), "\n", _jsx(_components.li, { children: "Strategic React optimization on appropriate components" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Success Criteria:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "✅ Search bar with real-time job filtering using useMemo" }), "\n", _jsx(_components.li, { children: "✅ Filter controls with stable event handlers using useCallback" }), "\n", _jsx(_components.li, { children: "✅ Job statistics that calculate efficiently with useMemo" }), "\n", _jsx(_components.li, { children: "✅ Job cards that only re-render when necessary (React.memo)" }), "\n", _jsx(_components.li, { children: "✅ Professional job search interface with smooth interactions" }), "\n", _jsx(_components.li, { children: "✅ Components organized in separate files with proper React architecture" }), "\n", _jsx(_components.li, { children: "✅ Strategic optimization usage - not every component needs optimization" }), "\n", _jsx(_components.li, { children: "✅ Performance benefits you can see and feel during interactions" }), "\n"] }), "\n", _jsx(_components.h2, { children: "Independent Learning Opportunity" }), "\n", _jsx(_components.p, { children: "Before looking at the step-by-step guide below, try building this job search platform yourself! Use these React concepts you've learned:" }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "React Concepts to Use:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Functional components with JSX for all job search components" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useState" }), " hook for managing search term, filters, and job data"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useMemo" }), " for expensive filtering and calculation operations"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "useCallback" }), " for stable event handler functions"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "React.memo" }), " for optimizing appropriate child components"] }), "\n", _jsx(_components.li, { children: "Component import/export with ES6 modules" }), "\n", _jsx(_components.li, { children: "Component-specific CSS for professional job search styling" }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Conceptual Hints:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "Think about which calculations are expensive (filtering 500+ jobs, calculating statistics)" }), "\n", _jsx(_components.li, { children: "Consider which event handlers should be stable (search, filter controls)" }), "\n", _jsx(_components.li, { children: "Remember that useMemo should be used for expensive operations, not simple ones" }), "\n", _jsx(_components.li, { children: "useCallback should be used for functions passed to React.memo components" }), "\n", _jsx(_components.li, { children: "Each component should have a single, clear responsibility in the job search flow" }), "\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 performance 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 performance concept in detail, follow these steps:" }), "\n", _jsx(_components.h3, { children: "Step 1: Create the Job Card Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "JobCard.js" }), " and build a clean job card component for displaying individual job listings."] }), "\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" }), " ", 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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: "\"" }), "job-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: "8", children: [_jsx(_components.span, { className: "token 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_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: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "25", 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: "26", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "27", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "28", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "React" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "memo" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token maybe-class-name", children: "JobCard" }), _jsx(_components.span, { className: "token punctuation", 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", _jsx(_components.li, { children: "Clean job card that displays job information professionally" }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "onJobSelect" }), " function handles job selection interactions"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { children: "React.memo" }), " wraps the component because job data doesn't change frequently"] }), "\n", _jsx(_components.li, { children: "Component focuses on displaying job information only" }), "\n", _jsx(_components.li, { children: "Professional job board card layout" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates React.memo on a component that receives stable props (job data doesn't change during search/filter operations)."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your job card component!"] }), "\n", _jsx(_components.h3, { children: "Step 2: Create the Search Bar Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "SearchBar.js" }), " and build a search input that triggers real-time job filtering."] }), "\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, { 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className: "token punctuation", children: "}" })] }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "6", 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 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className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "text", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "9", children: _jsxs(_components.span, { className: "token tag", children: [" ", _jsx(_components.span, { className: "token attr-name", children: "placeholder" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "Search jobs by title or company...", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), "\n"] }) }), _jsx(_components.span, { className: "code-line line-number", line: "10", children: 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"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: "\"" }), "search-input", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), "\n"] }) }), _jsxs(_components.span, { className: "code-line line-number", line: "13", 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: "14", 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, { 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" prevents re-renders when onSearchChange reference is stable"] }), "\n", _jsx(_components.li, { children: "Clean, professional search interface" }), "\n", _jsx(_components.li, { children: "Controlled input pattern for React best practices" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This shows React.memo on a component that should only re-render when its props actually change."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your search bar component!"] }), "\n", _jsx(_components.h3, { children: "Step 3: Create the Job Filters Component" }), "\n", _jsxs(_components.p, { children: ["Create a new file called ", _jsx(_components.code, { children: "JobFilters.js" }), " and build filter controls with stable event handlers."] }), "\n", _jsx(_components.pre, { className: "language-jsx", children: _jsxs(_components.code, { className: "language-jsx 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_jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'JavaScript Developer'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "65", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "company" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'CodeFactory'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "66", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "salary" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token number", children: "85000" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "67", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "location" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'Remote'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "68", 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: "'Full-time'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "69", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "description" }), _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token string", children: "'Build modern web applications with JavaScript.'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "70", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "companyLogo" }), _jsx(_components.span, { className: "token operator", children: ":" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "71", children: [" ", _jsx(_components.span, { className: "token string", children: "'https://images.unsplash.com/photo-1549923746-c502d488b3ea?w=50&h=50&fit=crop'" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "72", 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: "73", 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: "74", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "75", children: [" ", _jsx(_components.span, { className: "token comment", children: "// useMemo for expensive filtering calculation" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "76", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " filteredJobs ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useMemo" }), _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: "77", 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: "log" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'Filtering jobs...'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// You'll see this only when dependencies change" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "78", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "79", children: [" ", _jsx(_components.span, { className: "token keyword control-flow", children: "return" }), " jobs", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "filter" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "job" }), " ", _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: "80", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " matchesSearch ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "81", children: [" job", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "title" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toLowerCase" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "includes" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "searchTerm", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toLowerCase" }), _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 operator", children: "||" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "82", children: [" job", _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 method function property-access", children: "toLowerCase" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "includes" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "searchTerm", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "toLowerCase" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "83", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " matchesLocation ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "84", children: [" ", _jsx(_components.span, { className: "token operator", children: "!" }), "filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "location" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " job", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "location" }), " ", _jsx(_components.span, { className: "token operator", children: "===" }), " filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "location" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "85", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " matchesType ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "86", children: [" ", _jsx(_components.span, { className: "token operator", children: "!" }), "filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "jobType" }), " ", _jsx(_components.span, { className: "token operator", children: "||" }), " job", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "type" }), " ", _jsx(_components.span, { className: "token operator", children: "===" }), " filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "jobType" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "87", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " matchesSalary ", _jsx(_components.span, { className: "token operator", children: "=" }), " job", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "salary" }), " ", _jsx(_components.span, { className: "token operator", children: ">=" }), " filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "minSalary" }), _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 keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "90", children: [" matchesSearch ", _jsx(_components.span, { className: "token operator", children: "&&" }), " matchesLocation ", _jsx(_components.span, { className: "token operator", children: "&&" }), " matchesType ", _jsx(_components.span, { className: "token operator", children: "&&" }), " matchesSalary\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "91", 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: "92", 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: "93", 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: "94", children: [" jobs", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "95", children: [" searchTerm", _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "96", children: [" filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "location" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "97", children: [" filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "jobType" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "98", children: [" filters", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "minSalary" }), _jsx(_components.span, { className: "token punctuation", children: "," }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "99", 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: "100", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "101", children: [" ", _jsx(_components.span, { className: "token comment", children: "// useMemo for expensive statistics calculation" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "102", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " jobStats ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token function", children: "useMemo" }), _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: "103", 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: "log" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'Calculating stats...'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), " ", _jsx(_components.span, { className: "token comment", children: "// You'll see this only when filteredJobs change" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "104", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "105", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " totalJobs ", _jsx(_components.span, { className: "token operator", children: "=" }), " filteredJobs", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "length" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "106", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " averageSalary ", _jsx(_components.span, { className: "token operator", children: "=" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "107", children: [" totalJobs ", _jsx(_components.span, { className: "token operator", children: ">" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "108", children: [" ", _jsx(_components.span, { className: "token operator", children: "?" }), " filteredJobs", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "reduce" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsxs(_components.span, { className: "token parameter", children: ["sum", _jsx(_components.span, { className: "token punctuation", children: "," }), " job"] }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " sum ", _jsx(_components.span, { className: "token operator", children: "+" }), " job", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token property-access", children: "salary" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "/" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "109", children: [" ", _jsx(_components.span, { className: "token literal-property property", children: "totalJobs" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "110", children: [" ", _jsx(_components.span, { className: "token operator", children: ":" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "111", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " uniqueCompanies ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token keyword", children: "new" }), " ", _jsx(_components.span, { className: "token class-name", children: "Set" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "filteredJobs", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "map" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "job" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " job", _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 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 property-access", children: "size" }), _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 keyword control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), " totalJobs", _jsx(_components.span, { className: "token punctuation", children: "," }), " averageSalary", _jsx(_components.span, { className: "token punctuation", children: "," }), " uniqueCompanies ", _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: "[" }), "filteredJobs", _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 comment", children: "// useCallback for stable search handler" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "118", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " handleSearchChange ", _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 parameter", children: "term" }), " ", _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: "119", children: [" ", _jsx(_components.span, { className: "token function", children: "setSearchTerm" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "term", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "120", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: "," }), " ", _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: "121", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "122", children: [" ", _jsx(_components.span, { className: "token comment", children: "// useCallback for stable filter handler" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "123", children: [" ", _jsx(_components.span, { className: "token keyword", children: "const" }), " handleFilterChange ", _jsx(_components.span, { className: "token operator", children: 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_jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "167", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "p"] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "No jobs found matching your criteria." }), _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" })] }), 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className: "token punctuation", children: "" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "171", 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: "172", 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: "173", 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: "174", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "175", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "176", 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: "JobSearchApp" }), _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.strong, { children: "useMemo for filtering" }), ": Expensive job filtering only runs when search term or filters change"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "useMemo for statistics" }), ": Statistics calculation only runs when filtered jobs change"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "useCallback for handlers" }), ": Event handlers maintain stable references for React.memo components"] }), "\n", _jsx(_components.li, { children: "Professional job search layout with sidebar and main content" }), "\n", _jsx(_components.li, { children: "Complete optimization strategy combining all three techniques" }), "\n"] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": This demonstrates the complete optimization strategy - useMemo for expensive calculations, useCallback for stable functions, and React.memo on child components."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete job search platform!"] }), "\n", _jsx(_components.h3, { children: "Step 6: Update the App Component" }), "\n", _jsxs(_components.p, { children: ["Now update your ", _jsx(_components.code, { children: "App.js" }), " file to import and use your new JobSearchApp component."] }), "\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: "JobSearchApp" }) }), " ", _jsx(_components.span, { className: "token keyword module", children: "from" }), " ", _jsx(_components.span, { className: "token string", children: "'./JobSearchApp'" }), _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: "'./App.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: "App" }) }), _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 control-flow", children: "return" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [" ", _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), "div"] }), " ", _jsx(_components.span, { className: "token attr-name", children: "className" }), _jsxs(_components.span, { className: "token attr-value", children: [_jsx(_components.span, { className: "token punctuation attr-equals", children: "=" }), _jsx(_components.span, { className: "token punctuation", children: "\"" }), "App", _jsx(_components.span, { className: "token punctuation", children: "\"" })] }), _jsx(_components.span, { className: "token punctuation", children: ">" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "<" }), _jsx(_components.span, { className: "token class-name", children: "JobSearchApp" })] }), " ", _jsx(_components.span, { className: "token punctuation", children: "/>" })] }), _jsx(_components.span, { className: "token plain-text", children: "\n" })] }), _jsxs(_components.span, { className: "code-line line-number", line: "9", children: [_jsx(_components.span, { className: "token plain-text", children: " " }), _jsxs(_components.span, { className: "token tag", children: [_jsxs(_components.span, { className: "token tag", children: [_jsx(_components.span, { className: "token punctuation", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [" ", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "11", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line line-number", line: "12", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "13", children: [_jsx(_components.span, { className: "token keyword module", children: "export" }), " ", _jsx(_components.span, { className: "token keyword module", children: "default" }), " ", _jsx(_components.span, { className: "token maybe-class-name", children: "App" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "React Concept Applied" }), ": Clean component composition for a professional job search application."] }), "\n", _jsxs(_components.p, { children: [_jsx(_components.strong, { children: "Click \"Run\"" }), " to see your complete React job search platform!"] }), "\n", _jsx(_components.h2, { children: "Performance Testing Exercise" }), "\n", _jsx(_components.p, { children: "Now that you've built the job search platform, try this performance testing exercise:" }), "\n", _jsx(_components.h3, { children: "Test the Optimization Benefits" }), "\n", _jsxs(_components.ol, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Open Browser Developer Tools" }), " and go to the Console tab"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Type in the search bar" }), " - notice \"Filtering jobs...\" only logs when you actually change the search term"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Change filters" }), " - notice \"Calculating stats...\" only logs when the filtered results actually change"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Try rapid interactions" }), " - the interface should feel smooth and responsive"] }), "\n"] }), "\n", _jsx(_components.h3, { children: "Compare With and Without Optimization" }), "\n", _jsx(_components.p, { children: "To see the difference optimization makes, temporarily remove the useMemo and useCallback:" }), "\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 comment", children: "// Remove useMemo - see the performance difference" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "2", children: [_jsx(_components.span, { className: "token keyword", children: "const" }), " filteredJobs ", _jsx(_components.span, { className: "token operator", children: "=" }), " jobs", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "filter" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token parameter", children: "job" }), " ", _jsx(_components.span, { className: "token arrow operator", children: "=>" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "3", children: [" ", _jsx(_components.span, { className: "token console class-name", children: "console" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token method function property-access", children: "log" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "'Filtering jobs WITHOUT useMemo...'" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "4", children: [" ", _jsx(_components.span, { className: "token comment", children: "// ... filtering logic" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "5", 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: "6", children: "\n" }), _jsxs(_components.span, { className: "code-line line-number", line: "7", children: [_jsx(_components.span, { className: "token comment", children: "// Remove useCallback - see unnecessary re-renders" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "8", children: [_jsx(_components.span, { className: "token keyword", children: "const" }), " ", _jsx(_components.span, { className: "token function-variable function", children: "handleSearchChange" }), " ", _jsx(_components.span, { className: "token operator", children: "=" }), " ", _jsx(_components.span, { className: "token parameter", children: "term" }), " ", _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: "9", children: [" ", _jsx(_components.span, { className: "token function", children: "setSearchTerm" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), "term", _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line line-number", line: "10", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "You'll notice the console logs fire much more frequently without optimization, demonstrating the performance benefits." }), "\n", _jsx(_components.h2, { children: "Congratulations!" }), "\n", _jsx(_components.p, { children: "You've successfully built a professional job search platform with comprehensive React performance optimization! You've applied React performance concepts in a real-world context:" }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "React Performance Concepts Mastered:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Strategic useMemo Usage" }), ": Applied useMemo to expensive filtering and calculation operations"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Professional useCallback Implementation" }), ": Used useCallback for stable event handler references"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Complete Optimization Strategy" }), ": Combined React.memo, useMemo, and useCallback effectively"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Performance Decision Making" }), ": Learned when to optimize and when not to optimize"] }), "\n", _jsxs(_components.li, { children: ["✅ ", _jsx(_components.strong, { children: "Real-World Application" }), ": Built something genuinely useful for your portfolio"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "What You've Built:" }) }), "\n", _jsx(_components.p, { children: "Your job search platform demonstrates professional React development:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Smooth Search Experience" }), ": Real-time filtering that feels instant and responsive"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Strategic Optimization" }), ": React performance techniques used where they provide benefits"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Portfolio-Worthy Application" }), ": Something you can proudly show to employers"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Scalable Architecture" }), ": Component patterns that work for larger applications"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Professional Styling" }), ": Clean, modern job search interface"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Professional Development Patterns:" }) }), "\n", _jsx(_components.p, { children: "You've learned industry-standard React practices:" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Component-Specific CSS" }), ": Each component has its own focused CSS file"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Strategic Optimization" }), ": Apply useMemo and useCallback thoughtfully, not everywhere"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Job Search Performance" }), ": Professional patterns for search and filter functionality"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Component Architecture" }), ": Clean separation of concerns between components"] }), "\n"] }), "\n", _jsx(_components.p, { children: _jsx(_components.strong, { children: "Performance Benefits You Can See:" }) }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Instant Search" }), ": Typing in the search bar provides immediate, smooth results"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Responsive Filters" }), ": Filter controls update results without lag or delay"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Efficient Calculations" }), ": Statistics update only when necessary, not on every render"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.strong, { children: "Stable Components" }), ": Job cards don't flash or re-render unnecessarily"] }), "\n"] }), "\n", _jsx(_components.p, { children: "You're now ready to apply useMemo and useCallback optimization to any React application! You understand when to use each technique (expensive calculations vs. stable function references) and how they work together with React.memo for comprehensive performance optimization." }), "\n", _jsx(_components.p, { children: "The job search platform you've built uses the same React optimization patterns found in production applications like LinkedIn Jobs, Indeed, and other professional job boards. You've learned to think strategically about performance rather than optimizing everything blindly." }), "\n", _jsx(_components.p, { children: "Your React applications will now handle complex data and user interactions with professional-grade performance!" })] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };