The Math.expm1()
function returns
ex - 1
, where x
is the argument, and
e the base of the natural logarithms.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
The source for this interactive example is stored in a GitHub
repository. If you'd like to contribute to the interactive examples project, please
clone https://github.com/mdn/interactive-examples
and send us a pull request.
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
Browser compatibility
BCD tables only load in the browser