JavaScript Var, Let, and Const Explained

Sat, 25 Apr 2026 10:00:00 -0500

Most JavaScript code starts with a simple act: you give a value a name. We call that a variable declaration.

That sounds small, but the way you create that name affects how the rest of your code can use it. A variable might be available only inside a small “if” block, across an entire function, or in places you did not really mean to share it.

That is why var, let, and const are worth understanding before the code gets complicated.

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JavaScript Var, Let, and Const Explained