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'use strict'; Object.defineProperty(exports, "__esModule", { value: true }); var _mapLimit = require('./mapLimit.js'); var _mapLimit2 = _interopRequireDefault(_mapLimit); var _wrapAsync = require('./internal/wrapAsync.js'); var _wrapAsync2 = _interopRequireDefault(_wrapAsync); var _awaitify = require('./internal/awaitify.js'); var _awaitify2 = _interopRequireDefault(_awaitify); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } /** * The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time. * * @name groupByLimit * @static * @memberOf module:Collections * @method * @see [async.groupBy]{@link module:Collections.groupBy} * @category Collection * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over. * @param {number} limit - The maximum number of async operations at a time. * @param {AsyncFunction} iteratee - An async function to apply to each item in * `coll`. * The iteratee should complete with a `key` to group the value under. * Invoked with (value, callback). * @param {Function} [callback] - A callback which is called when all `iteratee` * functions have finished, or an error occurs. Result is an `Object` whoses * properties are arrays of values which returned the corresponding key. * @returns {Promise} a promise, if no callback is passed */ function groupByLimit(coll, limit, iteratee, callback) { var _iteratee = (0, _wrapAsync2.default)(iteratee); return (0, _mapLimit2.default)(coll, limit, (val, iterCb) => { _iteratee(val, (err, key) => { if (err) return iterCb(err); return iterCb(err, { key, val }); }); }, (err, mapResults) => { var result = {}; // from MDN, handle object having an `hasOwnProperty` prop var { hasOwnProperty } = Object.prototype; for (var i = 0; i < mapResults.length; i++) { if (mapResults[i]) { var { key } = mapResults[i]; var { val } = mapResults[i]; if (hasOwnProperty.call(result, key)) { result[key].push(val); } else { result[key] = [val]; } } } return callback(err, result); }); } exports.default = (0, _awaitify2.default)(groupByLimit, 4); module.exports = exports['default'];