Question

How to insert an item into an array at a specific index with JavaScript?

Posted on April 9, 2023
JavaScript
Asked by Bobby Iliev

Although JavaScript provides various methods to add and remove elements at the beginning or end of an array, inserting an element at a specific index requires a slightly different approach.

In this short tutorial, we will explore how to insert an item into an array at a specific index using the splice() method.

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Bobby Iliev

Site Moderator

• April 9, 2023

Accepted Answer

The Array.prototype.splice() method is a versatile and widely-used method to insert, remove, or replace elements within an array. To insert an item at a specific index, you can use the splice() method with the following syntax:

array.splice(index, 0, item);

Here, index is the position where you want to insert the item, 0 indicates that no elements should be removed, and item is the element you want to insert.

Example:

let fruits = ['apple', 'banana', 'orange'];
let index = 1;
let newItem = 'grape';

fruits.splice(index, 0, newItem);

console.log(fruits); // Output: ['apple', 'grape', 'banana', 'orange']

In this example, we inserted the ‘grape’ element at index 1 in the fruits array.

The splice() method offers a simple and efficient way to insert an item into an array at a specific index in JavaScript. By understanding how the method works, you can easily manipulate arrays to fit your needs.

Happy coding!