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54 lines
2.1 KiB
JavaScript
54 lines
2.1 KiB
JavaScript
6 years ago
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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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exports.default = groupBy;
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var _groupByLimit = require('./groupByLimit');
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var _groupByLimit2 = _interopRequireDefault(_groupByLimit);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Returns a new object, where each value corresponds to an array of items, from
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* `coll`, that returned the corresponding key. That is, the keys of the object
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* correspond to the values passed to the `iteratee` callback.
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*
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* Note: Since this function applies the `iteratee` to each item in parallel,
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* there is no guarantee that the `iteratee` functions will complete in order.
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* However, the values for each key in the `result` will be in the same order as
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* the original `coll`. For Objects, the values will roughly be in the order of
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* the original Objects' keys (but this can vary across JavaScript engines).
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*
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* @name groupBy
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* @static
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* @memberOf module:Collections
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* @method
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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 {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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* @example
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*
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* async.groupBy(['userId1', 'userId2', 'userId3'], function(userId, callback) {
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* db.findById(userId, function(err, user) {
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* if (err) return callback(err);
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* return callback(null, user.age);
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* });
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* }, function(err, result) {
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* // result is object containing the userIds grouped by age
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* // e.g. { 30: ['userId1', 'userId3'], 42: ['userId2']};
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* });
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*/
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function groupBy(coll, iteratee, callback) {
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return (0, _groupByLimit2.default)(coll, Infinity, iteratee, callback);
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}
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module.exports = exports['default'];
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