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JavaScript & Web Technologies Interview Questions & Answers

Closures, event loop, promises, async/await, DOM, React patterns, and modern ES6+.

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What is a closure? Show a practical example.

A closure is a function together with access to its surrounding lexical environment. The function can use those variables even after the outer function has returned. A counter factory can create indep...

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How do let, const, and var differ in scope and reassignment?

let and const are block-scoped, while var is function-scoped or script-global depending on context. const prevents reassigning the binding, but it does not make a referenced object immutable. let perm...

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