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The Math.acosh()
function returns the hyperbolic arc-cosine of a number, that is
Syntax
Math.acosh(x)
Parameters
x
- A number.
Return value
The hyperbolic arc-cosine of the given number. If the number is less than 1, NaN
.
Description
Because acosh()
is a static method of Math
, you always use it as Math.acosh()
, rather than as a method of a Math
object you created (Math
is no constructor).
Examples
Using Math.acosh()
Math.acosh(-1); // NaN Math.acosh(0); // NaN Math.acosh(0.5) // NaN Math.acosh(1); // 0 Math.acosh(2); // 1.3169578969248166
For values less than 1 Math.acosh()
returns NaN
.
Polyfill
For all , we have and so this can be emulated with the following function:
Math.acosh = Math.acosh || function(x) { return Math.log(x + Math.sqrt(x * x - 1)); };
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.acosh' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.acosh' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 38 | 25 (25) | No support | 25 | 7.1 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | 25.0 (25) | No support | No support | 8 |