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

   1 'use strict';
   2
   3 var log = Math.log, LOG2E = Math.LOG2E;
   4
   5 module.exports = function (x) {
   6         if (isNaN(x)) return NaN;
   7         x = Number(x);
   8         if (x < 0) return NaN;
   9         if (x === 0) return -Infinity;
  10         if (x === 1) return 0;
  11         if (x === Infinity) return Infinity;
  12
  13         return log(x) * LOG2E;
  14 };