--- /dev/null
+/**
+ * The base implementation of `_.sortBy` which uses `comparer` to define
+ * the sort order of `array` and replaces criteria objects with their
+ * corresponding values.
+ *
+ * @private
+ * @param {Array} array The array to sort.
+ * @param {Function} comparer The function to define sort order.
+ * @returns {Array} Returns `array`.
+ */
+function baseSortBy(array, comparer) {
+ var length = array.length;
+
+ array.sort(comparer);
+ while (length--) {
+ array[length] = array[length].value;
+ }
+ return array;
+}
+
+module.exports = baseSortBy;