# Arrays in JavaScript

Now we will begin to study a special data type called array. An array is a variable in which you can store a whole set of some values in an ordered way.

The values that an array stores are called elements. Elements are separated by a comma. It is common practice to put spaces after this comma.

Square brackets are used to create an array:

`let arr = [];`

Let's fill our array with strings:

`let arr = ['a', 'b', 'c'];`

And now let's fill the array with numbers:

`let arr = [1, 2, 3];`

In addition to strings and numbers, you can store all valid data types in an array, as well as mix them together in one array, example:

`let arr = [1, 2, 'a', 'b', null, true, false];`

Create an array of numbers. Print it to the screen with `alert` and also log it to the console with `console.log`.

Create an array of strings. Print it to the screen with `alert` and also log it to the console with `console.log`.

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