JavaScript Number() Function

## JavaScript Reference

Overview

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# JavaScript Number() Function

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

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

JavaScript Global Functions

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