71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _mapLimit = require('./mapLimit.js');
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var _mapLimit2 = _interopRequireDefault(_mapLimit);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify.js');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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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|AsyncIterable|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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* @returns {Promise} a promise, if no callback is passed
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*/
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function groupByLimit(coll, limit, iteratee, callback) {
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var _iteratee = (0, _wrapAsync2.default)(iteratee);
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return (0, _mapLimit2.default)(coll, limit, (val, iterCb) => {
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_iteratee(val, (err, key) => {
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if (err) return iterCb(err);
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return iterCb(err, { key, val });
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});
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}, (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;
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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];
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var { val } = mapResults[i];
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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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exports.default = (0, _awaitify2.default)(groupByLimit, 4);
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module.exports = exports['default'];
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