Add Item to Array in JavaScript

There are a few ways to add an item to an array in JavaScript.

This is the most common method, which adds a given item to the end of a given array:

const array = [1, 2, 3];

const item = 4;

array.push(item);

The below snippet has the same functionality but is typically significantly more performant:

const array = [1, 2, 3];

const item = 4;

array[array.length] = item;

You can also use the unshift method to add a given item to the beginning of a given array:

const array = [1, 2, 3];

const item = 4;

array.unshift(item);

Conclusion

And those are a few of the common approaches for adding items to arrays in JavaScript!