Web Reference: Jan 16, 2026 · JavaScript provides three ways to declare variables: var, let, and const, but they differ in scope, hoisting behaviour, and re-assignment rules. var: Declares variables with function or global scope and allows re-declaration and updates within the same scope. Oct 15, 2025 · In this post I’ll explain the differences in very simple words, show short code examples you can run, and give clear rules you can use right away. No heavy jargon — just practical advice for students and early React learners. If you’re learning JavaScript, you’ve probably seen var, let, and const and wondered: “Why are there three ways to declare variables… and which one should I use?”
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