'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = function (coll, limit, iteratee, callback) {
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callback = callback || _noop2.default;
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var _iteratee = (0, _wrapAsync2.default)(iteratee);
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(0, _mapLimit2.default)(coll, limit, function (val, callback) {
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_iteratee(val, function (err, key) {
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if (err) return callback(err);
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return callback(null, { key: key, val: val });
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});
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}, function (err, mapResults) {
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var result = {};
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// from MDN, handle object having an `hasOwnProperty` prop
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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for (var i = 0; i < mapResults.length; i++) {
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if (mapResults[i]) {
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var key = mapResults[i].key;
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var val = mapResults[i].val;
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if (hasOwnProperty.call(result, key)) {
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result[key].push(val);
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} else {
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result[key] = [val];
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}
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}
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}
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return callback(err, result);
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});
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};
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _mapLimit = require('./mapLimit');
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var _mapLimit2 = _interopRequireDefault(_mapLimit);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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;
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/**
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* The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
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*
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* @name groupByLimit
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* @static
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* @memberOf module:Collections
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* @method
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* @see [async.groupBy]{@link module:Collections.groupBy}
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* @category Collection
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* @param {Array|Iterable|Object} coll - A collection to iterate over.
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* @param {number} limit - The maximum number of async operations at a time.
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* @param {AsyncFunction} iteratee - An async function to apply to each item in
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* `coll`.
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* The iteratee should complete with a `key` to group the value under.
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* Invoked with (value, callback).
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* @param {Function} [callback] - A callback which is called when all `iteratee`
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* functions have finished, or an error occurs. Result is an `Object` whoses
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* properties are arrays of values which returned the corresponding key.
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*/
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module.exports = exports['default'];
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