Let in Javascript

JavaScript let keyword is used to declare block-scoped variables.

It was introduced in ECMAScript 6 as an alternative to var, which declares variables in the global or function scope.

The key difference is that let variables are block-scoped, while var variables are function or global scoped.

Declaring a variable with let

let x = 42;

This code declares a block-scoped variable x and initializes it with the value 42. x can only be accessed within the block it's declared in.

Example

let x = 42;

console.log(x); // 42

Here:

• We declared a variable x using let and initialized it with the value 42.
• We logged the value of x to the console.

Importantance of Let

Here are some important points about the let keyword in JavaScript:

• let are block-scoped.
• let must be declared before use.
• let cannot be redeclared.
• let cannot be hoisted.