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| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var expm1 = require('../internals/math-expm1');
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| 4 |
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| 5 | var exp = Math.exp;
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| 6 |
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| 7 | // `Math.tanh` method
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| 8 | // https://tc39.es/ecma262/#sec-math.tanh
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| 9 | $({ target: 'Math', stat: true }, {
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| 10 | tanh: function tanh(x) {
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| 11 | var n = +x;
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| 12 | var a = expm1(n);
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| 13 | var b = expm1(-n);
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| 14 | return a === Infinity ? 1 : b === Infinity ? -1 : (a - b) / (exp(n) + exp(-n));
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| 15 | }
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| 16 | });
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