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JavaScript type of Operator

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The JavaScript type of operator returns the datatype of an operand. You can see in the given example that we have used different variables to show the use of type of Operator.

JavaScript type of Operator

     

The JavaScript type of operator returns the datatype of an operand. You can see in the given example that we have used different variables to show the use of type of Operator. The operator returns 'object' for the variable1, as we have declared string inside the constructor of the class String. In the var2, we have declared the string therefore it returns the 'string'. The operator returns 'object' for the Date constructor and 'boolean' for the true or false values. It returns the 'number' on declaring the digit and returns 'object' for the null keyword. if a variable has not been defined, the typeof operator will return 'undefined'.

 

 

 

 

Here is the code:

<html>
<head>
<h2> Use of typeOf Operator </h2>
<script>
var var1 = new String("Hello World");
var var2="Hello World";
var var3=new Date();
var var4=true;
var var5=10;

document.write("<b>The var1 is </b>"+typeof(var1)+"<br>");
document.write("<b>The var2 is </b>"+typeof(var2)+"<br>");
document.write("<b>The var3 is </b>"+typeof(var3)+"<br>");
document.write("<b>The var4 is </b>"+typeof(var4)+"<br>");
document.write("<b>The var5 is </b>"+typeof(var5)+"<br>");
document.write(typeof null+"<br>");
document.write(typeof myVar);
</script>
</head>
<body bgcolor="lightBlue"/>
</html>

Output will be displayed as:

Type of operators in JavaScript

Download Source Code

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Posted on: November 15, 2008

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