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 |
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7 | var _once = require('./internal/once.js');
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8 |
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9 | var _once2 = _interopRequireDefault(_once);
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10 |
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11 | var _wrapAsync = require('./internal/wrapAsync.js');
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12 |
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13 | var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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14 |
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15 | var _awaitify = require('./internal/awaitify.js');
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16 |
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17 | var _awaitify2 = _interopRequireDefault(_awaitify);
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18 |
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19 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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20 |
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21 | /**
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22 | * Runs the `tasks` array of functions in parallel, without waiting until the
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23 | * previous function has completed. Once any of the `tasks` complete or pass an
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24 | * error to its callback, the main `callback` is immediately called. It's
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25 | * equivalent to `Promise.race()`.
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26 | *
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27 | * @name race
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28 | * @static
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29 | * @memberOf module:ControlFlow
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30 | * @method
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31 | * @category Control Flow
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32 | * @param {Array} tasks - An array containing [async functions]{@link AsyncFunction}
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33 | * to run. Each function can complete with an optional `result` value.
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34 | * @param {Function} callback - A callback to run once any of the functions have
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35 | * completed. This function gets an error or result from the first function that
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36 | * completed. Invoked with (err, result).
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37 | * @returns {Promise} a promise, if a callback is omitted
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38 | * @example
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39 | *
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40 | * async.race([
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41 | * function(callback) {
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42 | * setTimeout(function() {
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43 | * callback(null, 'one');
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44 | * }, 200);
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45 | * },
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46 | * function(callback) {
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47 | * setTimeout(function() {
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48 | * callback(null, 'two');
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49 | * }, 100);
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50 | * }
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51 | * ],
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52 | * // main callback
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53 | * function(err, result) {
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54 | * // the result will be equal to 'two' as it finishes earlier
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55 | * });
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56 | */
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57 | function race(tasks, callback) {
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58 | callback = (0, _once2.default)(callback);
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59 | if (!Array.isArray(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
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60 | if (!tasks.length) return callback();
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61 | for (var i = 0, l = tasks.length; i < l; i++) {
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62 | (0, _wrapAsync2.default)(tasks[i])(callback);
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63 | }
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64 | }
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65 |
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66 | exports.default = (0, _awaitify2.default)(race, 2);
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67 | module.exports = exports.default; |
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