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JavaScript Number() Function

Function Reference JavaScript Global Functions

Example

Convert different object values to their numbers:

var x1 = true;
var x2 = false;
var x3 = new Date();
var x4 = "999";
var x5 = "999 888";

var n =
Number(x1) + "<br>" +
Number(x2) + "<br>" +
Number(x3) + "<br>" +
Number(x4) + "<br>" +
Number(x5);

The result of n will 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

Function
Number() Yes Yes Yes Yes Yes

Syntax

Number(object)

Parameter Values

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

Technical Details

Return Value: A 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.
JavaScript Version: 1.1

Function Reference JavaScript Global Functions

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