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JavaScript Arrays
JavaScript arrays are used to store multiple values in a single variable.
Example
const cars = ["Saab", "Volvo", "BMW"];
It is a common practice to declare arrays with the const keyword.
Learn more about using const with arrays in the chapter: .
What is an Array?
An array is a special variable, which can hold more than one value at a time.
If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:
let car1 = "Saab";
let car2 = "Volvo";
let car3 = "BMW";
However, what if you want to loop through the cars and find a specific one? And what if you had not 3 cars, but 300?
The solution is an array!
An array can hold many values under a single name, and you can access the values by referring to an index number.
Creating an Array
Using an array literal is the easiest way to create a JavaScript Array.
Syntax:
const
array_name = [item1, item2, ...
];
Example
const cars = ["Saab", "Volvo", "BMW"];
Spaces and line breaks are not important. A declaration can span multiple lines:
Example
const cars =
[
"Saab",
"Volvo",
"BMW"
];
You can also create an array, and then provide the elements:
Example
const cars =
[];
cars[0]= "Saab";
cars[1]= "Volvo";
cars[2]= "BMW";
Using the JavaScript Keyword new
The following example also creates an Array, and assigns values to it:
Example
const cars = new Array("Saab", "Volvo", "BMW");