24 lines
704 B
JavaScript
24 lines
704 B
JavaScript
|
var $ = require('../internals/export');
|
||
|
|
var log1p = require('../internals/math-log1p');
|
||
|
|
|
||
|
|
var nativeAcosh = Math.acosh;
|
||
|
|
var log = Math.log;
|
||
|
|
var sqrt = Math.sqrt;
|
||
|
|
var LN2 = Math.LN2;
|
||
|
|
|
||
|
|
var FORCED = !nativeAcosh
|
||
|
|
// V8 bug: https://code.google.com/p/v8/issues/detail?id=3509
|
||
|
|
|| Math.floor(nativeAcosh(Number.MAX_VALUE)) != 710
|
||
|
|
// Tor Browser bug: Math.acosh(Infinity) -> NaN
|
||
|
|
|| nativeAcosh(Infinity) != Infinity;
|
||
|
|
|
||
|
|
// `Math.acosh` method
|
||
|
|
// https://tc39.github.io/ecma262/#sec-math.acosh
|
||
|
|
$({ target: 'Math', stat: true, forced: FORCED }, {
|
||
|
|
acosh: function acosh(x) {
|
||
|
|
return (x = +x) < 1 ? NaN : x > 94906265.62425156
|
||
|
|
? log(x) + LN2
|
||
|
|
: log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1));
|
||
|
|
}
|
||
|
|
});
|