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18 lines
450 B
18 lines
450 B
10 years ago
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// Parts of implementation taken from es6-shim project
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// See: https://github.com/paulmillr/es6-shim/blob/master/es6-shim.js
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'use strict';
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var expm1 = require('../expm1')
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, abs = Math.abs, exp = Math.exp, e = Math.E;
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module.exports = function (x) {
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if (isNaN(x)) return NaN;
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x = Number(x);
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if (x === 0) return x;
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if (!isFinite(x)) return x;
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if (abs(x) < 1) return (expm1(x) - expm1(-x)) / 2;
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return (exp(x - 1) - exp(-x - 1)) * e / 2;
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};
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