1 | ;
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = parallel;
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7 |
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8 | var _eachOf = require('./eachOf');
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9 |
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10 | var _eachOf2 = _interopRequireDefault(_eachOf);
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11 |
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12 | var _parallel2 = require('./internal/parallel');
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13 |
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14 | var _parallel3 = _interopRequireDefault(_parallel2);
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15 |
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16 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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17 |
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18 | /**
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19 | * Run the `tasks` collection of functions in parallel, without waiting until
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20 | * the previous function has completed. If any of the functions pass an error to
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21 | * its callback, the main `callback` is immediately called with the value of the
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22 | * error. Once the `tasks` have completed, the results are passed to the final
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23 | * `callback` as an array.
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24 | *
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25 | * **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
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26 | * parallel execution of code. If your tasks do not use any timers or perform
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27 | * any I/O, they will actually be executed in series. Any synchronous setup
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28 | * sections for each task will happen one after the other. JavaScript remains
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29 | * single-threaded.
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30 | *
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31 | * **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the
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32 | * execution of other tasks when a task fails.
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33 | *
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34 | * It is also possible to use an object instead of an array. Each property will
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35 | * be run as a function and the results will be passed to the final `callback`
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36 | * as an object instead of an array. This can be a more readable way of handling
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37 | * results from {@link async.parallel}.
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38 | *
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39 | * @name parallel
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40 | * @static
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41 | * @memberOf module:ControlFlow
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42 | * @method
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43 | * @category Control Flow
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44 | * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection of
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45 | * [async functions]{@link AsyncFunction} to run.
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46 | * Each async function can complete with any number of optional `result` values.
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47 | * @param {Function} [callback] - An optional callback to run once all the
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48 | * functions have completed successfully. This function gets a results array
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49 | * (or object) containing all the result arguments passed to the task callbacks.
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50 | * Invoked with (err, results).
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51 | * @returns {Promise} a promise, if a callback is not passed
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52 | *
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53 | * @example
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54 | * async.parallel([
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55 | * function(callback) {
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56 | * setTimeout(function() {
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57 | * callback(null, 'one');
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58 | * }, 200);
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59 | * },
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60 | * function(callback) {
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61 | * setTimeout(function() {
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62 | * callback(null, 'two');
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63 | * }, 100);
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64 | * }
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65 | * ],
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66 | * // optional callback
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67 | * function(err, results) {
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68 | * // the results array will equal ['one','two'] even though
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69 | * // the second function had a shorter timeout.
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70 | * });
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71 | *
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72 | * // an example using an object instead of an array
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73 | * async.parallel({
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74 | * one: function(callback) {
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75 | * setTimeout(function() {
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76 | * callback(null, 1);
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77 | * }, 200);
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78 | * },
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79 | * two: function(callback) {
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80 | * setTimeout(function() {
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81 | * callback(null, 2);
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82 | * }, 100);
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83 | * }
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84 | * }, function(err, results) {
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85 | * // results is now equals to: {one: 1, two: 2}
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86 | * });
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87 | */
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88 | function parallel(tasks, callback) {
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89 | return (0, _parallel3.default)(_eachOf2.default, tasks, callback);
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90 | }
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91 | module.exports = exports['default']; |
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