1var compareAscending = require('./_compareAscending');
2
3/**
4 * Used by `_.orderBy` to compare multiple properties of a value to another
5 * and stable sort them.
6 *
7 * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
8 * specify an order of "desc" for descending or "asc" for ascending sort order
9 * of corresponding values.
10 *
11 * @private
12 * @param {Object} object The object to compare.
13 * @param {Object} other The other object to compare.
14 * @param {boolean[]|string[]} orders The order to sort by for each property.
15 * @returns {number} Returns the sort order indicator for `object`.
16 */
17function compareMultiple(object, other, orders) {
18  var index = -1,
19      objCriteria = object.criteria,
20      othCriteria = other.criteria,
21      length = objCriteria.length,
22      ordersLength = orders.length;
23
24  while (++index < length) {
25    var result = compareAscending(objCriteria[index], othCriteria[index]);
26    if (result) {
27      if (index >= ordersLength) {
28        return result;
29      }
30      var order = orders[index];
31      return result * (order == 'desc' ? -1 : 1);
32    }
33  }
34  // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
35  // that causes it, under certain circumstances, to provide the same value for
36  // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
37  // for more details.
38  //
39  // This also ensures a stable sort in V8 and other engines.
40  // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
41  return object.index - other.index;
42}
43
44module.exports = compareMultiple;
45