JavaScript Array Object

JavaScript Array Object

The Array object is used to store multiple values in a single variable.

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:

var car1=”Saab”;
var car2=”Volvo”;
var 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 best solution here is to use an array!

An array can hold all your variable values under a single name. And you can access the values by referring to the array name.

Each element in the array has its own ID so that it can be easily accessed.

Syntax

arrayName = new Array(number of elements);

You refer to containers in the array as arrayName[0], arrayName[1], arrayName[2], and so on. Each of these individual containers can be manipulated and used just like a regular variable.

Create an Array

An array can be defined in three ways. The following code creates an Array object called myCars:

1. var myCars=new Array(); // regular array (add an optional integer
myCars[0]=”Saab”; // argument to control array’s size)
myCars[1]=”Volvo”;
myCars[2]=”BMW”;

2. var myCars=new Array(“Saab”,”Volvo”,”BMW”); // condensed array

3. var myCars=[“Saab”,”Volvo”,”BMW”]; // literal array

Access an Array

You can refer to a particular element in an array by referring to the name of the array and the index number. The index number starts at 0.The following code line:

document.write(myCars[0]);

Modify Values in an Array

Here the value at index 0 has been assigned a new value in myCars array.

myCars[0]=”Opel”;
document.write(myCars[0]);
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