How to insert an item into an array at particular index in java script

Question

can anyone tell if there is a method to insert an element at specific index in an array? I'm using push() method to insert elements at the end of the array but I need to insert elements at a specific index. How can I do that?

Divya · Accepted Answer

You can insert an element into an array using splice method. Splice follows the syntax `arrayName.splice(startIndex, deleteCount, item1, item2,...)`. For inserting elements deleteCount should be 0.

## To insert a single element

```javascript
Array.prototype.insert = function ( index, item ) {
    this.splice( index, 0, item );
};

let arr = [ 1, 2, 3, 5, 6];
arr.insert(3, 4);

console.log(arr);
```

## To insert multiple elements

```javascript
let array = [1, 5, 6, 7, 8, 9, 10]

let insert = (arr, index, ...newItems) => [...arr.slice(0, index), ...newItems, ...arr.slice(index)];

let newArray = insert(array, 1, 2, 3, 4);

console.log(newArray);

```

How to insert an item into an array at particular index in java script

1 Answer

To insert a single element

To insert multiple elements