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