Using JavaScript to Insert Item Into Array

We can use JavaScript to insert an item into an array by using the JavaScript Array splice() method. We will need to pass the index and an object to the splice() method to insert an object at a certain position.

var numArray = [0, 1, 2, 4];

numArray.splice(3, 0, 3);

console.log(numArray);

#Output:
[0, 1, 2, 3, 4]

Let’s go over quickly how the splice method works for adding an item to an array.

The first parameter in the splice method will be the index position in the array that you want to add the item or items.

The second parameter will be how many items we want to remove. Since we want to only add items to an array, we will always pass the number 0 as this parameter value.

And finally, the third parameter will be the item or items we want to add to the array.

So here is an example setup of adding the string “hello” to the 5th index spot of an array using the splice method.

someArray.splice(5, 0, "hello");

When working with collections of data, the ability to make changes and modify these collections easily is valuable.

One such case is if you want to insert an item into an array in your JavaScript code.

To insert an item into an array in JavaScript, you can use the JavaScript splice() method.

Below is our simple example again of how you can insert an item into an array using JavaScript.

var numArray = [0, 1, 2, 4];

numArray.splice(3, 0, 3);

console.log(numArray);

#Output:
[0, 1, 2, 3, 4]

Inserting Multiple Items into an Array Using JavaScript

If we want to insert multiple items into an array using JavaScript, we can still use the splice() method for this.

To do this, we simply add as many items to the end of the splice() method that we want added to the array.

Here is an example of how to add multiple items to an array.

var colorsArray = ["blue", "green", "yellow", "red", "pink", "orange", "black"];

colorsArray.splice(4, 0, "white", "purple", "brown");

console.log(colorsArray);

#Output:
["blue", "green", "yellow", "red", "white", "purple", "brown", "pink", "orange", "black"]

Hopefully this article has been useful for you to learn how to use JavaScript to insert an item into an array.