How to Insert an Item into a JavaScript Array at a Specific Index?

How to Add an Item to an Array at a Specific Index?

If you're looking to insert an item into an array at a specific index, JavaScript provides the splice method. This method takes three arguments:

• index: The position where you want to add the item.
• deleteCount: The number of items to delete from the array at the index specified. In this case, specify 0 to add without deleting.
• item: The item you want to insert into the array.

For example, consider the following array:

arr = ['Jani', 'Hege', 'Stale', 'Kai Jim', 'Borge'];

To insert the item "Lene" into index 2, use the following code:

arr.splice(2, 0, 'Lene');

This will result in the following array:

arr = ['Jani', 'Hege', 'Lene', 'Stale', 'Kai Jim', 'Borge'];

You can also use the splice method to insert multiple items into an array at a specific index. The following code inserts the items ["Lene", "Ola", "Kari"] into index 2:

arr.splice(2, 0, 'Lene', 'Ola', 'Kari');

This will result in the following array:

arr = ['Jani', 'Hege', 'Lene', 'Ola', 'Kari', 'Stale', 'Kai Jim', 'Borge'];

The splice method is a versatile tool that allows you to manipulate arrays with ease. You can use it to insert, delete, and replace items at specific indices.

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