Why are closures important in JavaScript interviews?
Closures are the foundation of many interview questions: data privacy, currying, debounce, throttle, memoize, and the loop closure bug. Understanding closures is essential for almost every JS interview.
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More FAQs in Top JavaScript Interview Topics for Frontend Developers
Closures, event loop, this keyword, call/apply/bind, promises/async-await, prototypes, debounce/throttle, currying, event bubbling/delegation, polyfills, CORS, and async/defer. Study each deeply and implement from scratch.
Implementing debounce or throttle from scratch (Flipkart, Walmart), polyfills for map/filter/reduce/bind, the event loop output question (sync, microtask, macrotask order), and currying (sum(1)(2)(3) - Amazon).
Yes. Be able to implement map, filter, reduce, bind, and Promise.all from scratch. Interviewers often ask for polyfills to test your understanding of how these methods work internally.
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