The Math.fround() function returns the nearest single precision float representation of a number.

Syntax

Math.fround(x)

Parameters

x
A number.

Description

Because fround() is a static method of Math, you always use it as Math.fround(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.fround()

Math.fround(0);     // 0
Math.fround(1);     // 1
Math.fround(1.337); // 1.3370000123977661
Math.fround(1.5);   // 1.5
Math.fround(NaN);   // NaN

Polyfill

This can be emulated with the following function, if Float32Array are supported:

Math.fround = Math.fround || (function (array) {
  return function(x) {
    return array[0] = x, array[0];
  };
})(Float32Array(1));

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Math.fround' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Math.fround' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 38 26 (26) No support 25 7.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support (Yes) (Yes) No support No support 8

See also

Document Tags and Contributors

 Contributors to this page: fscholz, Permutator, isiahmeadows, xfq, Mingun, ziyunfei, realityking
 Last updated by: fscholz,