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Diffstat (limited to 'node_modules/async/parallel.js')
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diff --git a/node_modules/async/parallel.js b/node_modules/async/parallel.js new file mode 100644 index 0000000..76bc624 --- /dev/null +++ b/node_modules/async/parallel.js @@ -0,0 +1,180 @@ +'use strict'; + +Object.defineProperty(exports, "__esModule", { + value: true +}); +exports.default = parallel; + +var _eachOf = require('./eachOf.js'); + +var _eachOf2 = _interopRequireDefault(_eachOf); + +var _parallel2 = require('./internal/parallel.js'); + +var _parallel3 = _interopRequireDefault(_parallel2); + +function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } + +/** + * Run the `tasks` collection of functions in parallel, without waiting until + * the previous function has completed. If any of the functions pass an error to + * its callback, the main `callback` is immediately called with the value of the + * error. Once the `tasks` have completed, the results are passed to the final + * `callback` as an array. + * + * **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about + * parallel execution of code. If your tasks do not use any timers or perform + * any I/O, they will actually be executed in series. Any synchronous setup + * sections for each task will happen one after the other. JavaScript remains + * single-threaded. + * + * **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the + * execution of other tasks when a task fails. + * + * It is also possible to use an object instead of an array. Each property will + * be run as a function and the results will be passed to the final `callback` + * as an object instead of an array. This can be a more readable way of handling + * results from {@link async.parallel}. + * + * @name parallel + * @static + * @memberOf module:ControlFlow + * @method + * @category Control Flow + * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection of + * [async functions]{@link AsyncFunction} to run. + * Each async function can complete with any number of optional `result` values. + * @param {Function} [callback] - An optional callback to run once all the + * functions have completed successfully. This function gets a results array + * (or object) containing all the result arguments passed to the task callbacks. + * Invoked with (err, results). + * @returns {Promise} a promise, if a callback is not passed + * + * @example + * + * //Using Callbacks + * async.parallel([ + * function(callback) { + * setTimeout(function() { + * callback(null, 'one'); + * }, 200); + * }, + * function(callback) { + * setTimeout(function() { + * callback(null, 'two'); + * }, 100); + * } + * ], function(err, results) { + * console.log(results); + * // results is equal to ['one','two'] even though + * // the second function had a shorter timeout. + * }); + * + * // an example using an object instead of an array + * async.parallel({ + * one: function(callback) { + * setTimeout(function() { + * callback(null, 1); + * }, 200); + * }, + * two: function(callback) { + * setTimeout(function() { + * callback(null, 2); + * }, 100); + * } + * }, function(err, results) { + * console.log(results); + * // results is equal to: { one: 1, two: 2 } + * }); + * + * //Using Promises + * async.parallel([ + * function(callback) { + * setTimeout(function() { + * callback(null, 'one'); + * }, 200); + * }, + * function(callback) { + * setTimeout(function() { + * callback(null, 'two'); + * }, 100); + * } + * ]).then(results => { + * console.log(results); + * // results is equal to ['one','two'] even though + * // the second function had a shorter timeout. + * }).catch(err => { + * console.log(err); + * }); + * + * // an example using an object instead of an array + * async.parallel({ + * one: function(callback) { + * setTimeout(function() { + * callback(null, 1); + * }, 200); + * }, + * two: function(callback) { + * setTimeout(function() { + * callback(null, 2); + * }, 100); + * } + * }).then(results => { + * console.log(results); + * // results is equal to: { one: 1, two: 2 } + * }).catch(err => { + * console.log(err); + * }); + * + * //Using async/await + * async () => { + * try { + * let results = await async.parallel([ + * function(callback) { + * setTimeout(function() { + * callback(null, 'one'); + * }, 200); + * }, + * function(callback) { + * setTimeout(function() { + * callback(null, 'two'); + * }, 100); + * } + * ]); + * console.log(results); + * // results is equal to ['one','two'] even though + * // the second function had a shorter timeout. + * } + * catch (err) { + * console.log(err); + * } + * } + * + * // an example using an object instead of an array + * async () => { + * try { + * let results = await async.parallel({ + * one: function(callback) { + * setTimeout(function() { + * callback(null, 1); + * }, 200); + * }, + * two: function(callback) { + * setTimeout(function() { + * callback(null, 2); + * }, 100); + * } + * }); + * console.log(results); + * // results is equal to: { one: 1, two: 2 } + * } + * catch (err) { + * console.log(err); + * } + * } + * + */ +function parallel(tasks, callback) { + return (0, _parallel3.default)(_eachOf2.default, tasks, callback); +} +module.exports = exports['default'];
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