Math.fround

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

Syntax

Math.fround(x)

Parameters

x

A number.

Return value

The nearest single precision float representation of the given 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

See also

• Math.round()