Saturday 25 January 2014

type of operator

Typeof operator
·         It is a unary operator that is placed before its single operand, which can be of any type. Its value is a string indicating the data type of the operand.
·         The typeof operator evaluates to “number”, “string”, or “Boolean” if its operand is a number, string, or Boolean value and returns true or false based on the evaluation.
Type
STRING returned by type of
String
“number”
Boolean
“Boolean”
Object
“object”
Function
“function”
Undefined
“undefined”
Null
“object”

Example:
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var x = 123;              // x is a number
var y = new Number(123);  // y is an object
var txt = typeof(x) + " " + typeof(y);
document.getElementById("demo").innerHTML=txt;
</script>
</body>

</html>

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