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JavaScript Array Object Reference


The Array Object

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

Syntax for creating an Array object:

var myCars=new Array("Saab","Volvo","BMW")

To access and to set values inside an array, you must use the index numbers as follows:

  • myCars[0] is the first element
  • myCars[1] is the second element
  • myCars[2] is the third element

Array Object Properties

FF: Firefox, N: Netscape, IE: Internet Explorer

Property Description FF N IE 
constructor Returns a reference to the array function that created the object 1 2 4
index   1 3 4
input   1 3 4
length Sets or returns the number of elements in an array 1 2 4
prototype Allows you to add properties and methods to the object 1 2 4

Array Object Methods

Method Description FF N IE
concat() Joins two or more arrays and returns the result 1 4 4
join() Puts all the elements of an array into a string. The elements are separated by a specified delimiter 1 3 4
pop() Removes and returns the last element of an array 1 4 5.5
push() Adds one or more elements to the end of an array and returns the new length 1 4 5.5
reverse() Reverses the order of the elements in an array 1 3 4
shift() Removes and returns the first element of an array 1 4 5.5
slice() Returns selected elements from an existing array 1 4 4
sort() Sorts the elements of an array 1 3 4
splice() Removes and adds new elements to an array 1 4 5.5
toSource() Represents the source code of an object 1 4 -
toString() Converts an array to a string and returns the result 1 3 4
unshift() Adds one or more elements to the beginning of an array and returns the new length 1 4 6
valueOf() Returns the primitive value of an Array object 1 2 4



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