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

   1 // Thanks: https://github.com/monolithed/ECMAScript-6/blob/master/ES6.js
   2
   3 'use strict';
   4
   5 var log = Math.log;
   6
   7 module.exports = function (x) {
   8         if (isNaN(x)) return NaN;
   9         x = Number(x);
  10         if (x < -1) return NaN;
  11         if (x === -1) return -Infinity;
  12         if (x === 0) return x;
  13         if (x === Infinity) return Infinity;
  14
  15         if (x > -1.0e-8 && x < 1.0e-8) return (x - x * x / 2);
  16         return log(1 + x);
  17 };