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
).
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
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
.
Polyfill
if (Number.EPSILON === undefined) { Number.EPSILON = Math.pow(2, -52); }
Examples
Testing equality
x = 0.2; y = 0.3; z = 0.1; equal = (Math.abs(x - y + z) < Number.EPSILON);
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Number.EPSILON' in that specification. |
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.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
EPSILON | Chrome Full support 34 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 21 | Safari Full support 9 | WebView Android Full support ≤37 | Chrome Android Full support 34 | Firefox Android Full support 25 | Opera Android Full support 21 | Safari iOS Full support 9 | Samsung Internet Android Full support 2.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support
See also
- The
Number
object it belongs to.