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JavaScript Number() Function

Function Reference JavaScript Global Functions

Example

Convert different object values to their numbers:

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");

var n = Number(test1) + "<br>" + Number(test2) + "<br>" + Number(test3) + "<br>" + Number(test4) + "<br>" + Number(test5);

The result of n could be:

1
0
1382704503079
999
NaN

Try it yourself »

Definition and Usage

The Number() function converts the object argument to a number that represents the object's value.

If the value cannot be converted to a legal number, NaN is returned.

Note: If the parameter is a Date object, the Number() function returns the number of milliseconds since midnight January 1, 1970 UTC.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The Number() function is supported in all major browsers.


Syntax

Number(object)

Parameter Values

Parameter Description
object Optional. A JavaScript object. If no argument is provided, it returns 0.

Return Value

Type Description
Number Returns different object values to their numbers. If the value cannot be converted to a legal number, NaN is returned. If no argument is provided, it returns 0.

Technical Details

JavaScript Version: 1.1


Function Reference JavaScript Global Functions

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