Bump to v3.4.0.

internal/compareMultiple.js

@@ -0,0 +1,44 @@
+import baseCompareAscending from './baseCompareAscending';
+
+/**
+ * Used by `_.sortByOrder` to compare multiple properties of each element
+ * in a collection and stable sort them in the following order:
+ *
+ * If orders is unspecified, sort in ascending order for all properties.
+ * Otherwise, for each property, sort in ascending order if its corresponding value in
+ * orders is true, and descending order if false.
+ *
+ * @private
+ * @param {Object} object The object to compare to `other`.
+ * @param {Object} other The object to compare to `object`.
+ * @param {boolean[]} orders The order to sort by for each property.
+ * @returns {number} Returns the sort order indicator for `object`.
+ */
+function compareMultiple(object, other, orders) {
+  var index = -1,
+      objCriteria = object.criteria,
+      othCriteria = other.criteria,
+      length = objCriteria.length,
+      ordersLength = orders.length;
+
+  while (++index < length) {
+    var result = baseCompareAscending(objCriteria[index], othCriteria[index]);
+    if (result) {
+      if (index >= ordersLength) {
+        return result;
+      } else {
+        return orders[index] ? result : result * -1;
+      }
+    }
+  }
+  // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
+  // that causes it, under certain circumstances, to provide the same value for
+  // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
+  // for more details.
+  //
+  // This also ensures a stable sort in V8 and other engines.
+  // See https://code.google.com/p/v8/issues/detail?id=90 for more details.
+  return object.index - other.index;
+}
+
+export default compareMultiple;