The Number.EPSILON property represents the difference between 1 and the smallest floating point number greater than 1.
You do not have to create a Number object to access this static property (use Number.EPSILON).
Property attributes of Number.EPSILON |
|
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Description
The EPSILON property has a value of approximately 2.2204460492503130808472633361816E-16, or 2-52.
Examples
Testing equality
x = 0.2; y = 0.3; z = 0.1; equal = (Math.abs(x - y + z) < Number.EPSILON);
Polyfill
if (Number.EPSILON === undefined){
Number.EPSILON = Math.pow(2, -52);
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Number.EPSILON' in that specification. |
Standard | Initial definition. |
| ECMAScript Latest Draft (ECMA-262) The definition of 'Number.EPSILON' in that specification. |
Living Standard |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | 25 | No | (Yes) | 9 |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | 25 | No | (Yes) | 9 |
See also
- The
Numberobject it belongs to.
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