Object-Oriented JavaScript - Second Edition

Arrays

Now that you know about the basic primitive data types in JavaScript, it's time to move to a more powerful data structure—the array.

So, what is an array? It's simply a list (a sequence) of values. Instead of using one variable to store one value, you can use one array variable to store any number of values as elements of the array.

To declare a variable that contains an empty array, you use square brackets with nothing between them:

> var a = [];

To define an array that has three elements, you do this:

> var a = [1, 2, 3];

When you simply type the name of the array in the console, you get the contents of your array:

> a;
[1, 2, 3]

Now the question is how to access the values stored in these array elements. The elements contained in an array ...