11 lines
238 B
JavaScript
11 lines
238 B
JavaScript
"use strict";
|
|
|
|
var exp = Math.exp;
|
|
|
|
module.exports = function (value) {
|
|
if (isNaN(value)) return NaN;
|
|
value = Number(value);
|
|
if (value === 0) return 1;
|
|
if (!isFinite(value)) return Infinity;
|
|
return (exp(value) + exp(-value)) / 2;
|
|
};
|