17 lines
404 B
JavaScript
17 lines
404 B
JavaScript
|
'use strict';
|
||
|
|
var $ = require('../internals/export');
|
||
|
|
var expm1 = require('../internals/math-expm1');
|
||
|
|
|
||
|
|
var exp = Math.exp;
|
||
|
|
|
||
|
|
// `Math.tanh` method
|
||
|
|
// https://tc39.es/ecma262/#sec-math.tanh
|
||
|
|
$({ target: 'Math', stat: true }, {
|
||
|
|
tanh: function tanh(x) {
|
||
|
|
var n = +x;
|
||
|
|
var a = expm1(n);
|
||
|
|
var b = expm1(-n);
|
||
|
|
return a === Infinity ? 1 : b === Infinity ? -1 : (a - b) / (exp(n) + exp(-n));
|
||
|
|
}
|
||
|
|
});
|