Math.asinh()
The Math.asinh()
function returns the hyperbolic arcsine
of a number, that is
Syntax
Math.asinh(x)
Parameters
x
-
A number.
Return value
The hyperbolic arcsine of the given number.
Description
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).
Examples
Using Math.asinh()
Math.asinh(1); // 0.881373587019543
Math.asinh(0); // 0
Polyfill
Math.asinh
can be emulated with the following function:
if (!Math.asinh) Math.asinh = function(x) {
var absX = Math.abs(x), w
if (absX < 3.725290298461914e-9) // |x| < 2^-28
return x
if (absX > 268435456) // |x| > 2^28
w = Math.log(absX) + Math.LN2
else if (absX > 2) // 2^28 >= |x| > 2
w = Math.log(2 * absX + 1 / (Math.sqrt(x * x + 1) + absX))
else
var t = x * x, w = Math.log1p(absX + t / (1 + Math.sqrt(1 + t)))
return x > 0 ? w : -w
}
Math.log1p
may also have to be polyfilled; see Math.log1p
for details.
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.asinh |
Browser compatibility
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