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91 lines
3.1 KiB
JavaScript
91 lines
3.1 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 = parallel;
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var _eachOf = require('./eachOf');
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var _eachOf2 = _interopRequireDefault(_eachOf);
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var _parallel2 = require('./internal/parallel');
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var _parallel3 = _interopRequireDefault(_parallel2);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Run the `tasks` collection of functions in parallel, without waiting until
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* the previous function has completed. If any of the functions pass an error to
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* its callback, the main `callback` is immediately called with the value of the
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* error. Once the `tasks` have completed, the results are passed to the final
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* `callback` as an array.
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*
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* **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
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* parallel execution of code. If your tasks do not use any timers or perform
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* any I/O, they will actually be executed in series. Any synchronous setup
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* sections for each task will happen one after the other. JavaScript remains
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* single-threaded.
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*
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* **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the
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* execution of other tasks when a task fails.
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*
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* It is also possible to use an object instead of an array. Each property will
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* be run as a function and the results will be passed to the final `callback`
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* as an object instead of an array. This can be a more readable way of handling
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* results from {@link async.parallel}.
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*
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* @name parallel
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {Array|Iterable|AsyncIterable|Object} tasks - A collection of
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* [async functions]{@link AsyncFunction} to run.
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* Each async function can complete with any number of optional `result` values.
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* @param {Function} [callback] - An optional callback to run once all the
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* functions have completed successfully. This function gets a results array
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* (or object) containing all the result arguments passed to the task callbacks.
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* Invoked with (err, results).
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* @returns {Promise} a promise, if a callback is not passed
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*
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* @example
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* async.parallel([
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* function(callback) {
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* setTimeout(function() {
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* callback(null, 'one');
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* }, 200);
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* },
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* function(callback) {
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* setTimeout(function() {
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* callback(null, 'two');
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* }, 100);
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* }
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* ],
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* // optional callback
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* function(err, results) {
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* // the results array will equal ['one','two'] even though
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* // the second function had a shorter timeout.
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* });
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*
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* // an example using an object instead of an array
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* async.parallel({
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* one: function(callback) {
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* setTimeout(function() {
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* callback(null, 1);
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* }, 200);
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* },
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* two: function(callback) {
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* setTimeout(function() {
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* callback(null, 2);
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* }, 100);
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* }
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* }, function(err, results) {
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* // results is now equals to: {one: 1, two: 2}
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* });
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*/
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function parallel(tasks, callback) {
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return (0, _parallel3.default)(_eachOf2.default, tasks, callback);
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}
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module.exports = exports['default'];
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