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JavaScript

JavaScript Let

The let keyword declares block-scoped variables that can change.

Read Time

5 min read

Difficulty

Beginner

Last Updated

Jun 15, 2026

Version

v1.0.0

Introduction

JavaScript introduced `let` in 2015 to solve problems with older variable types. Variables declared with `let` only exist inside the specific block of code where they were created. Developers can update their values later.

Example

1/* this uses let */
2let points = 50;
3points = 100; // Value changed successfully

Key Points

`let` variables cannot be redeclared.
`let` variables can be reassigned.
`let` variables have block scope.
`let` prevents accidental global variables.

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