This is an experimental technology, part of the Harmony (ECMAScript 6) proposal.
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.


The Math.asinh() function returns the hyperbolic arcsine of a number, that is

Math.asinh(x)=arsinh(x)= the unique ysuch thatsinh(y)=x\mathtt{\operatorname{Math.asinh}(x)} = \operatorname{arsinh}(x) = \text{ the unique } \; y \; \text{such that} \; \sinh(y) = x




A number.


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


Example: Using Math.asinh

Math.asinh(1);  // 0.881373587019543
Math.asinh(0);  // 0


We have arsinh(x)=ln(x+x2+1)\operatorname {arsinh} (x) = \ln \left(x + \sqrt{x^{2} + 1} \right) and so this can be emulated by the following function:

function asinh(x) {
  return Math.log(x + Math.sqrt(x * x + 1));


Specification Status Comment
ECMAScript Language Specification 6th Edition (ECMA-262) Draft

Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support Not supported 25 (25) Not supported Not supported Not supported
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support Not supported Not supported 25.0 (25) Not supported Not supported Not supported


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