git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var exp = Math.exp;
   4
   5 module.exports = function (x) {
   6         if (isNaN(x)) return NaN;
   7         x = Number(x);
   8         if (x === 0) return 1;
   9         if (!isFinite(x)) return Infinity;
  10         return (exp(x) + exp(-x)) / 2;
  11 };