Inserting an element into an array at a specific index in JavaScript

In this tutorial, we are going to learn about how to insert element/item into an array at a sepcific index in JavaScript.

JavaScript gives us a splice( ) method by using that we can add new elements into an array at a specific index.

The splice(index,numberofItemstoRemove,item) method takes three arguments which are

index : On which index we need to insert new items.

numberofItemstoRemove : We need to specify how many items to remove (in our case we are not removing any so that this argument will be 0).

item: The item you need to add.

Let’s see an example.

const arr = [1,2,4,5,6];

arr.splice(2,0,3);  //  splice(index,numberofItemstoRemove,item)
console.log(arr);

//output [1,2,3,4,5,6]

In the above example, we are inserting 3 into an array at index 2.

We can insert more than one item into an array.

const arr = [1,2,5,6];

array.splice(2,0,3,4);
console.log(1,2,3,4,5,6);

//output [1,2,3,4,5,6]

In the above example, we are inserting 3,4 into an array at index 2.