How should I prepare for JavaScript interview questions?
Understand each concept deeply, implement polyfills and utilities from scratch (no libraries), practice coding in an editor, practice explaining in simple terms, and know the real-world use cases for each technique.
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More FAQs in JavaScript Interview Questions: Introduction
call/apply/bind, polyfills (bind, map, filter, reduce), currying, debouncing, throttling, async/defer, event bubbling, event delegation, prototypes, recursion, CORS, and closures. Amazon asks currying, Flipkart asks debounce, Walmart asks throttle, Ola asks async/defer, Oyo asks event bubbling.
sum(1)(2)(3)(4)..(n) - a currying question where you implement a function that can be chained to sum numbers. This tests understanding of currying, closures, and function chaining.
Debouncing - implementing a debounce function that delays the execution of a function until the user stops calling it for a specified delay. This tests understanding of closures, setTimeout, and event optimization.
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