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"use strict";
var exp = Math.exp;
module.exports = function (value) {
var num1, num2;
if (isNaN(value)) return NaN;
value = Number(value);
if (value === 0) return value;
if (value === Infinity) return 1;
if (value === -Infinity) return -1;
num1 = exp(value);
if (num1 === Infinity) return 1;
num2 = exp(-value);
if (num2 === Infinity) return -1;
return (num1 - num2) / (num1 + num2);
};