What JavaScript interview questions are commonly asked by top companies?
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.
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More FAQs in JavaScript Interview Questions: Introduction
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.
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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