1  'use strict';
 2  
 3  Object.defineProperty(exports, "__esModule", {
 4    value: true
 5  });
 6  exports.default = groupBySeries;
 7  
 8  var _groupByLimit = require('./groupByLimit');
 9  
10  var _groupByLimit2 = _interopRequireDefault(_groupByLimit);
11  
12  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
13  
14  /**
15   * The same as [`groupBy`]{@link module:Collections.groupBy} but runs only a single async operation at a time.
16   *
17   * @name groupBySeries
18   * @static
19   * @memberOf module:Collections
20   * @method
21   * @see [async.groupBy]{@link module:Collections.groupBy}
22   * @category Collection
23   * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
24   * @param {AsyncFunction} iteratee - An async function to apply to each item in
25   * `coll`.
26   * The iteratee should complete with a `key` to group the value under.
27   * Invoked with (value, callback).
28   * @param {Function} [callback] - A callback which is called when all `iteratee`
29   * functions have finished, or an error occurs. Result is an `Object` whoses
30   * properties are arrays of values which returned the corresponding key.
31   * @returns {Promise} a promise, if no callback is passed
32   */
33  function groupBySeries(coll, iteratee, callback) {
34    return (0, _groupByLimit2.default)(coll, 1, iteratee, callback);
35  }
36  module.exports = exports['default'];