1  var baseEach = require('./_baseEach');
 2  
 3  /**
 4   * Aggregates elements of `collection` on `accumulator` with keys transformed
 5   * by `iteratee` and values set by `setter`.
 6   *
 7   * @private
 8   * @param {Array|Object} collection The collection to iterate over.
 9   * @param {Function} setter The function to set `accumulator` values.
10   * @param {Function} iteratee The iteratee to transform keys.
11   * @param {Object} accumulator The initial aggregated object.
12   * @returns {Function} Returns `accumulator`.
13   */
14  function baseAggregator(collection, setter, iteratee, accumulator) {
15    baseEach(collection, function(value, key, collection) {
16      setter(accumulator, value, iteratee(value), collection);
17    });
18    return accumulator;
19  }
20  
21  module.exports = baseAggregator;