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

   1 'use strict';
   2
   3 var toPosInt = require('../../number/to-pos-integer')
   4   , callable = require('../../object/valid-callable')
   5   , value    = require('../../object/valid-value')
   6
   7   , floor    = Math.floor;
   8
   9 module.exports = function (compareFn) {
  10         var length, low, high, middle;
  11
  12         value(this);
  13         callable(compareFn);
  14
  15         length = toPosInt(this.length);
  16         low = 0;
  17         high = length - 1;
  18
  19         while (low <= high) {
  20                 middle = floor((low + high) / 2);
  21                 if (compareFn(this[middle]) < 0) high = middle - 1;
  22                 else low = middle + 1;
  23         }
  24
  25         if (high < 0) return 0;
  26         if (high >= length) return length - 1;
  27         return high;
  28 };