JavaScript
Difference Between let, const, and var in JavaScript
2/27/2025
5 min read
Learn the key differences between let, const, and var in JavaScript.
Difference Between let, const, and var in JavaScript
Description:
Understanding the differences between let, const, and var helps prevent variable-related bugs in JavaScript.
Explanation:
var: Function-scoped, hoisted, can be redeclared.let: Block-scoped, not hoisted, can be reassigned.const: Block-scoped, cannot be reassigned.
Example:
var a = 10;
let b = 20;
const c = 30;
a = 15; // Allowed
b = 25; // Allowed
// c = 35; // Error: Assignment to constant variable
