How to add new elements at the beginning of an array JavaScript

In this tutorial, we are going to learn about how to add new elements to an array at the beginning in JavaScript.

JavaScript offers us Array.unshift() by using that we can add new elements to the beginning of an array.

Note: The unshift() modifies the original array and returns the new length of an array.

Adding single element at the beginning

Example:

const arr =  [2,3,4];

arr.unshift(1); // adding 1 at beginning

console.log(arr); // [1,2,3,4]

Adding multiple elements at beginning

We can also pass multiple elements to an array by passing multiple arguments to the unshift() method.

const arr =  [2,3,4];

arr.unshift(0,1); // adding 0,1 at beginning

console.log(arr); // [0,1,2,3,4]