--- /dev/null
+var arrayAggregator = require('./_arrayAggregator'),
+ baseAggregator = require('./_baseAggregator'),
+ baseIteratee = require('./_baseIteratee'),
+ isArray = require('./isArray');
+
+/**
+ * Creates a function like `_.groupBy`.
+ *
+ * @private
+ * @param {Function} setter The function to set accumulator values.
+ * @param {Function} [initializer] The accumulator object initializer.
+ * @returns {Function} Returns the new aggregator function.
+ */
+function createAggregator(setter, initializer) {
+ return function(collection, iteratee) {
+ var func = isArray(collection) ? arrayAggregator : baseAggregator,
+ accumulator = initializer ? initializer() : {};
+
+ return func(collection, setter, baseIteratee(iteratee), accumulator);
+ };
+}
+
+module.exports = createAggregator;