Array Object Overview

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

Creating an Array Object

To create an Array object, use the new keyword and assign the result to a variable.

The following examples show the different ways to create Array objects:

var myArray = new Array();
myArray[0] = "Red";
myArray[1] = "Blue";
myArray[2] = "Green";

or

var myArray = new Array("Red", "Blue", "Green");

or

var myArray = ["Red", "Blue", "Green"];

Accessing Elements in an Array Object

To access an element within an Array object, referring to the name of the array and the index number. The index number starts at 0.

The following example shows how to access an element within an Array object:

var favoriteColor = myArray[1];

Modifying Elements in an Array Object

To modify a value in an existing array, just add a new value to the array with a specified index number:

The following example shows how to modify an element within an Array object:

myArray[1] = "Yellow";

Properties

Property	Description
constructor	Returns the function that created the object's prototype
length	Sets or returns the number of elements in an array
prototype	Allows you to add properties and methods to an object

Methods

Method	Description
concat()	Joins two or more arrays, and returns a copy of the joined arrays
join()	Joins all elements of an array into a string
pop()	Removes the last element of an array, and returns that element
push()	Adds new elements to the end of an array, and returns the new length
reverse()	Reverses the order of the elements in an array
shift()	Removes the first element of an array, and returns that element
slice()	Selects a part of an array, and returns the new array
sort()	Sorts the elements of an array
splice()	Adds/Removes elements from an array
toString()	Converts an array to a string, and returns the result
unshift()	Adds new elements to the beginning of an array, and returns the new length
valueOf()	Returns the primitive value of an array