Elep

// (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.JSONGroupBy = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
'use strict';

function groupBy(items, properties, collect) {
  if (arguments.length < 2) return arr;
  var groups = _groupBy(items, properties);
  // collect other properties values in array
  if (collect && collect.length > 0)
    groups = collectProperties(groups, collect);

return groups;
}

// collect the properties in an array 
function collectProperties(groups, properties) { 
  var collection = {};
  for (var key in groups) {
    if (Array.isArray(groups[key])) {
      collection[key] = groups[key].reduce(function(coll, item) {
        properties.forEach(function(prop) { 
          if (!coll[prop]) coll[prop] = [];
          coll[prop].push(valueAt(item,prop));
        })
        return coll;
      }, {})
    } else {
      collection[key] = collectProperties(groups[key], properties);
    }
  }
  return collection;
}

// similar to Array.findIndex but more efficient
// http://stackoverflow.com/q/1344500/713573
function locationOf(element, array, start, end) {
  start = start || 0;
  end = end || array.length;
  var pivot = parseInt(start + (end - start) / 2, 10);
  if (end-start <= 1 || array[pivot] === element) return pivot;
  if (array[pivot] < element) {
    return locationOf(element, array, pivot, end);
  } else {
    return locationOf(element, array, start, pivot);
  }
}
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