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17 lines
400 B
17 lines
400 B
"use strict"; |
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var exp = Math.exp; |
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module.exports = function (value) { |
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var num1, num2; |
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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 (value === Infinity) return 1; |
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if (value === -Infinity) return -1; |
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num1 = exp(value); |
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if (num1 === Infinity) return 1; |
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num2 = exp(-value); |
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if (num2 === Infinity) return -1; |
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return (num1 - num2) / (num1 + num2); |
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};
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