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JavaScript Number() Function

Definition and Usage

The Number() function converts the value of an object to a number.

Syntax

Number(object)

Parameter Description
object Required. A JavaScript object


Tips and Notes

Note: If the parameter is a Date object, the Number() function returns the number of milliseconds since midnight January 1, 1970 UTC.
Note: If the object's value cannot be converted to a number, the Number() function returns NaN.

Example

In this example we will try to convert different objects to numbers:

<script type="text/javascript">
var test1= new Boolean(true);
var test2= new Boolean(false);
var test3= new Date();
var test4= new String("999");
var test5= new String("999 888");
document.write(Number(test1)+ "<br />");
document.write(Number(test2)+ "<br />");
document.write(Number(test3)+ "<br />");
document.write(Number(test4)+ "<br />");
document.write(Number(test5)+ "<br />");
</script>

The output of the code above will be:

1
0
1336862567118
999
NaN
JavaScript Number() Function Reviewed by 1000sourcecodes on 03:32 Rating: 5
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