Bump to v4.1.0.

_baseAggregator.js

@@ -0,0 +1,22 @@
+define(['./_baseEach'], function(baseEach) {
+
+  /**
+   * Aggregates elements of `collection` on `accumulator` with keys transformed
+   * by `iteratee` and values set by `setter`.
+   *
+   * @private
+   * @param {Array|Object} collection The collection to iterate over.
+   * @param {Function} setter The function to set `accumulator` values.
+   * @param {Function} iteratee The iteratee to transform keys.
+   * @param {Object} accumulator The initial aggregated object.
+   * @returns {Function} Returns `accumulator`.
+   */
+  function baseAggregator(collection, setter, iteratee, accumulator) {
+    baseEach(collection, function(value, key, collection) {
+      setter(accumulator, value, iteratee(value), collection);
+    });
+    return accumulator;
+  }
+
+  return baseAggregator;
+});