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1How does async/await work in JavaScript?2Why use hooks in React?3Explain the CSS box model 4call() vs apply()5call() vs bind()6Client-side rendering vs server-side rendering 7How does the composition pattern work in React?8Controlled vs uncontrolled components 9How does CSRF work?10How does the CSS display property work?11How does CSS selector specificity work?12Debouncing vs throttling — what's the difference?13How does event delegation work in JS?14Explain the JavaScript event loop 15Techniques for improving website performance 16Promises vs callbacks 17How does prototypal inheritance work?18When does React trigger a re-render?19Rules of React hooks 20sessionStorage vs localStorage vs cookies 21Shallow copy vs deep copy 22How does the 'this' keyword behave in JavaScript?23Unit vs integration vs E2E testing 24How does useCallback work in React?25How does the useEffect dependency array work?26How does useMemo work in React?27Purpose of the useRef hook in React 28What happens when you call a useState setter?29var vs let vs const 30How does the Virtual DOM work in React?31What does preventDefault() do?32What happens after you type a URL and press enter?33Explain closures in JavaScript 34How does A/B testing work?35Explain responsive design 36Why shouldn't you mutate state in React?37How does AbortController work?38How do aria-label, aria-labelledby, and aria-live work?39Why are array indices bad keys in React?40Patterns for async data loading in React 41async vs defer 42How does caching improve performance?43Explain callback functions in JavaScript 44Classical vs prototypal inheritance 45Closures for creating private variables 46How does code splitting work?47Common data fetching pitfalls in React 48Common pitfalls with 'this'49CommonJS vs ES Modules 50How does CSS positioning work?

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Global scope vs function scope vs block scope

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