| 'use strict'; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| |
| var _mapLimit = require('./mapLimit'); |
| |
| var _mapLimit2 = _interopRequireDefault(_mapLimit); |
| |
| var _wrapAsync = require('./internal/wrapAsync'); |
| |
| var _wrapAsync2 = _interopRequireDefault(_wrapAsync); |
| |
| var _awaitify = require('./internal/awaitify'); |
| |
| 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']; |