Object-Oriented JavaScript - Third 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 can use square brackets with nothing between them, as shown in the following line of code:

    > var a = []; 

To define an array that has three elements, you can write the following line of code:

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

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

    > a; 
    [1, 2, 3] 

Now the question is how to access ...