Difference between var, let and const keywords in JavaScript

In JavaScript, users can declare a variable using 3 keywords that are var, let, and const. In this article, we will see the differences between the var, let, and const keywords. We will discuss the scope and other required concepts about each keyword.

var keyword in JavaScript: The var is the oldest keyword to declare a variable in JavaScript.

var is lexically scoped meaning when declare, you can assess it any where in your code and it
Can be reassigned to another variable.

let keyword in JavaScript: The let keyword is an improved version of the var keyword.
Scope: block scoped: The scope of a let variable is only block scoped. It can’t be accessible outside the particular block.
Blocks like (if) block and (for loop) block.

const keyword in JavaScript: The const keyword has all the properties that are the same as the let keyword, except the user cannot update it.

It is also a block scoped: When users declare a const variable, they need to initialize it, otherwise, it returns an error. The user cannot update the const variable once it is declared.


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