The Valley of Code: Arrays

Learn how to use arrays in JavaScript

An array is a collection of elements.

We can initialize an empty array in these 2 different ways:

const a = []

The first is using the array literal syntax.

You can pre-fill the array using this syntax:

const a = [1, 2, 3]

An array can hold any value, even value of different types, like numbers and strings or even other arrays:

const a = [1, 'Flavio', ['a', 'b']]

You can access any element of the array by referencing its index. The first item has index zero:

const a = [1, 2, 3]

a[0] //1
a[1] //2
a[2] //3

0:	▶︎ Introduction
1:	Number of items in an array
2:	Create a new array from an existing array
3:	Adding an item to an existing array
4:	Adding at the beginning of an array
5:	Adding multiple items to the array
6:	Removing an item from an array
7:	Modifying an existing array without mutating it
8:	Arrays of arrays
9:	Filling an array
10:	Array destructuring
11:	Check if an array contains a specific value