70 lines
2.1 KiB
JavaScript
70 lines
2.1 KiB
JavaScript
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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 = race;
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var _isArray = require('lodash/isArray');
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var _isArray2 = _interopRequireDefault(_isArray);
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var _noop = require('lodash/noop');
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var _noop2 = _interopRequireDefault(_noop);
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var _once = require('./internal/once');
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var _once2 = _interopRequireDefault(_once);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Runs the `tasks` array of functions in parallel, without waiting until the
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* previous function has completed. Once any of the `tasks` complete or pass an
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* error to its callback, the main `callback` is immediately called. It's
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* equivalent to `Promise.race()`.
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*
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* @name race
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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} tasks - An array containing [async functions]{@link AsyncFunction}
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* to run. Each function can complete with an optional `result` value.
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* @param {Function} callback - A callback to run once any of the functions have
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* completed. This function gets an error or result from the first function that
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* completed. Invoked with (err, result).
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* @returns undefined
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* @example
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*
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* async.race([
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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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* // main callback
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* function(err, result) {
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* // the result will be equal to 'two' as it finishes earlier
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* });
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*/
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function race(tasks, callback) {
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callback = (0, _once2.default)(callback || _noop2.default);
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if (!(0, _isArray2.default)(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
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if (!tasks.length) return callback();
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for (var i = 0, l = tasks.length; i < l; i++) {
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(0, _wrapAsync2.default)(tasks[i])(callback);
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}
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}
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module.exports = exports['default'];
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