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14 lines
337 B
14 lines
337 B
"use strict"; |
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var log = Math.log; |
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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 < -1) return NaN; |
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if (value > 1) return NaN; |
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if (value === -1) return -Infinity; |
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if (value === 1) return Infinity; |
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if (value === 0) return value; |
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return 0.5 * log((1 + value) / (1 - value)); |
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};
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