I volontari di MDN non hanno ancora tradotto questo articolo in Italiano. Unisciti a noi e traducilo tu stesso.
Puoi anche consultare l’articolo in English (US).

The Math.expm1() function returns ex - 1, where x is the argument, and e the base of the natural logarithms.




A number.

Return value

A number representing ex - 1, where e is Euler's number and x is the argument.


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).


Using Math.expm1()

Math.expm1(-1); // -0.6321205588285577 
Math.expm1(0);  // 0
Math.expm1(1);  // 1.718281828459045


This can be emulated with the help of the Math.exp() function:

Math.expm1 = Math.expm1 || function(x) {
  return Math.exp(x) - 1;


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Math.expm1' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Math.expm1' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support38 Yes25 No258
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes25 Yes8 Yes

See also

Tag del documento e collaboratori

Hanno collaborato alla realizzazione di questa pagina: wbamberg, fscholz, jameshkramer, eduardoboucas, Mingun, realityking, SphinxKnight, fred.wang
Ultima modifica di: wbamberg,