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The Array object is used to store a set of values in a single variable name. Each value is an element of the array and has an associated index number. 
You create an instance of the Array object with the "new" keyword. The following example creates two arrays, both of three elements:

var family_names=new Array(3)
  var family_names=new Array("Tove","Jani","Stale")

You can refer to a particular element in the array by using the name of the array and the index number. The index number starts at 0. 
If you create an array with a single numeric parameter, you can assign data to each of the elements in the array like this:

family_names[0]="Tove" family_names[1]="Jani" family_names[2]="Stale"

And the data can be retrieved by using the index number of the particular array element you want, like this:

mother=family_names[0] father=family_names[1] 

The Array object's properties and methods are described below: NN: Netscape, IE: Internet Explorer

Methods: Syntax: object.method_name()

The Boolean object is an object wrapper for a Boolean value and it is used to convert a non-Boolean value to a Boolean value.

The Boolean object is an object wrapper for a Boolean value and it is used to convert a non-Boolean value to a Boolean value, either true or false.
If the Boolean object has no initial value or if it is 0, null, "", false, or NaN, the initial value is false. Otherwise it is true (even with the string "false").
All the following lines of code create Boolean objects with an initial value of false:

var b1=new Boolean()
  var b2=new Boolean(0)
  var b3=new Boolean(null)
  var b4=new Boolean("")
  var b5=new Boolean(false) var b6=new Boolean(NaN)

All the following lines of code create Boolean objects with an initial value of true:

var b1=new Boolean(true)
  var b2=new Boolean("true")
  var b3=new Boolean("false")
  var b4=new Boolean("Richard")

The Boolean object's properties and methods are described below: NN: Netscape, IE: Internet Explorer

Methods: Syntax: object.method_name()

The Date object is used to work with dates and times.

Date Object

The Date object is used to work with dates and times. 
To create an instance of the Date object and assign it to a variable called "d", you do the following:

var d=new Date()

After creating an instance of the Date object, you can access all the methods of the Date object from the "d" variable.
To return the current day in a month (from 1-31) of a Date object, write the following:

d.getDate()

The Date object can also have the following parameters:

new Date(milliseconds) new Date(dateString) new Date(yr_num, mo_num, day_num [, hr_num, min_num, sec_num, ms_num])

• milliseconds - the number of milliseconds since 01 January, 1970 00:00:00
• dateString - the date in a format that is recognized by the Date.parse method
• yr_num, mo_num, day_num - the year, month or day of the date
• hr_num, min_num, sec_num, ms_num - the hours, minutes, seconds and milliseconds

If you only use Date(), JavaScript creates an object for today's date according to the time on the local machine.
Here are some examples on how to create Date objects:

var d=new Date("October 12, 1988 13:14:00")
  var d=new Date("October 12, 1988")
  var d=new Date(88,09,12,13,14,00)
  var d=new Date(88,09,12)
  var d=new Date(500)

The Date object's properties and methods are described below: NN: Netscape, IE: Internet Explorer

Methods: Syntax: object.method_name()

The built-in Math object includes mathematical constants and functions.

The built-in Math object includes mathematical constants and functions. You do not need to create the Math object before using it.
To store a random number between 0 and 1 in a variable called "r_number":

r_number=Math.random()

To store the rounded number of 8.6 in a variable called "r_number":

r_number=Math.round(8.6)

The Math object's properties and methods are described below: NN: Netscape, IE: Internet Explorer

Methods: Syntax: object.method_name()

The String object is used to work with text.

The String object is used to work with text.
The String object's properties and methods are described below: NN: Netscape, IE: Internet Explorer

Methods: Syntax: object.method_name()