Web Reference: Sep 12, 2025 · What’s the difference between var, let, and const and what is the Temporal Dead Zone? JavaScript provides three ways to declare variables: var, let, and const, but they differ in scope, hoisting behaviour, and re-assignment rules. The difference between var, let, and const is one of the most frequently asked JavaScript interview questions. All three are used to declare var iables, but they behave differently in terms of scope, reassignment, and hoisting. var is the older way to declare var iables. It is function- scope d, not block- scope d. Mar 24, 2026 · Explore 100+ JavaScript interview questions and answers for 2026, covering basics to advanced topics like closures, hoisting, promises, DOM, and ES6.
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