Data Type in JavaScript 

JavaScript has five primitive data type.

1  Number

2  String

3  Boolean

4  Undefined

5  Null

Any data type other than above 5 types is called object.  

In javascript there are two types to object.

1. Build in object
2. Custom object

Build in Object :  Examples include array, date etc. In below example we have create the object of date by using date constructor.

    var date= new Date();

    alert(date.getDate);

    alert(date.getFullYear);

Custom objects : In JavaScript we don't have classes. We use function instead of classes.

In JavaScript there are two ways to create a custom object.

1. Constructor function

2. Literal notation

Constructor Function

<script type="text/javascript">

    function Student(firstName, lastName)

    {

       this.firstName = firstName;

       this.lastName = lastName;

       this.getFullName = function ()

       {

           return this.firstName + " " + this.lastName;

       }

    }

    var student= new Student("Jitendra", "Kachhi");

    document.write("First Name :" + student.firstName + "<br/>");

    document.write("Last Name : " + student.lastName + "<br/>");

    document.write("Full Name :" + student.getFullName() + "<br/>");

</script>

literal Notation

<script type="text/javascript">

    var student=

    {

       firstName: "Jitendra",

       lastName: "Kachhi",

       FullName: function ()

       {

           return this.firstName + " " + this.lastName;

       }

    }

    document.write("FirstName = " + student.firstName + "<br/>");

    document.write("LastName = " + student.lastName + "<br/>");

    document.write("FullName = " + student.FullName() + "<br/>");

</script>

Note:- literal Notation will have only single object(singleton), if we want to create multiple object use Constructor Function.

Thanks you for reading.