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The Math.expm1()
function returns ex - 1
, where x
is the argument, and e the base of the natural logarithms.
Syntax
Math.expm1(x)
Parameters
x
- A number.
Return value
A number representing ex - 1
, where e
is Euler's number and x
is the argument.
Description
Because expm1()
is a static method of Math
, you always use it as Math.expm1()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Examples
Using Math.expm1()
Math.expm1(-1); // -0.6321205588285577 Math.expm1(0); // 0 Math.expm1(1); // 1.718281828459045
Polyfill
This can be emulated with the help of the Math.exp()
function:
Math.expm1 = Math.expm1 || function(x) { return Math.exp(x) - 1; };
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.expm1' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.expm1' 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 |