W3cubDocs

/JavaScript

Number() constructor

The Number() creates a Number object.

Syntax

new Number(value)

Parameters

value

The numeric value of the object being created.

Examples

Creating Number objects

const a = new Number('123'); // a === 123 is false
const b = Number('123');     // b === 123 is true
a instanceof Number;         // is true
b instanceof Number;         // is false

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
Number
1
12
1
3
3
1
1
18
4
10.1
1
1.0
1.0
0.10.0

See also

  • A polyfill of modern Number behavior (with support binary and octal literals) is available in core-js
  • NaN
  • The Math global object
  • Integers with arbitrary precision: BigInt

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/Number