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15 lines
350 B
15 lines
350 B
"use strict"; |
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var log = Math.log, sqrt = Math.sqrt; |
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module.exports = function (value) { |
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if (isNaN(value)) return NaN; |
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value = Number(value); |
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if (value === 0) return value; |
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if (!isFinite(value)) return value; |
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if (value < 0) { |
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value = -value; |
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return -log(value + sqrt(value * value + 1)); |
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} |
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return log(value + sqrt(value * value + 1)); |
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};
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