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18 lines
385 B
18 lines
385 B
10 years ago
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// Thanks: https://github.com/monolithed/ECMAScript-6/blob/master/ES6.js
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'use strict';
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var log = Math.log;
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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 < -1) return NaN;
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if (x === -1) return -Infinity;
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if (x === 0) return x;
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if (x === Infinity) return Infinity;
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if (x > -1.0e-8 && x < 1.0e-8) return (x - x * x / 2);
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return log(1 + x);
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};
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