Math.tanh()
The Math.tanh()
function returns the hyperbolic tangent
of a number, that is
Syntax
Math.tanh(x)
Parameters
x
-
A number.
Return value
The hyperbolic tangent of the given number.
Description
Because tanh()
is a static method of Math
, you always use it
as Math.tanh()
, rather than as a method of a Math
object you
created (Math
is not a constructor).
Polyfill
This can be emulated with the help of the Math.exp()
function:
Math.tanh = Math.tanh || function(x){
var a = Math.exp(+x), b = Math.exp(-x);
return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (a + b);
}
Examples
Using Math.tanh()
Math.tanh(0); // 0
Math.tanh(Infinity); // 1
Math.tanh(1); // 0.7615941559557649
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.tanh |
Browser compatibility
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