JavaScript Arrays

What is an Array?

An array is a special variable, which can hold more than one value. It is a common data structure used to store ordered collections.

Creating Arrays

The easiest way to create an array is using an array literal [].

const array_name = [item1, item2, ...];

Accessing Elements

You access an array element by referring to the index number.

Note: Array indexes start with 0. [0] is the first element. [1] is the second element.

The Length Property

The length property of an array returns the length of an array (the number of array elements).

Looping Array Elements

The safest way to loop through an array is using a for loop or the forEach() method.

Arrays are Objects

Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays.

To check if a variable is an array, you can use Array.isArray().

Summary