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define(['./_arrayAggregator', './_baseAggregator', './_baseIteratee', './isArray'], function(arrayAggregator, baseAggregator, baseIteratee, 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, 2), accumulator);    };  }
  return createAggregator;});