There are 3 ways to define an array in JavaScript
a) Conventional array

Conventional array looks like

var mycars=new Array()
mycars[0]="Toyota"
mycars[1]="Honda"
mycars[2]="Mitsubishi"

You can expand and contract the array as desired, by adding new array elements with first array element should have an index number of 0.

With a conventional array, you have choice of presetting the array's length when defining it, by passing in a numeric integer into the Array() constructor:

var mycars=new Array(3)

In this case 3 array elements will automatically be created, each with a value still "undefined." Also mycars.length will return 3.

b) Condensed array

The second way to define an array is called a Condensed array; it differs from Conventional array as it allows you to combine the array and array elements definitions into one step:

var mycars=new Array("Toyota", "Honda", "Mitsubishi")

This is suitable if you know all the array element values beforehand.

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