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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = race;
var _isArray = require('lodash/isArray');
var _isArray2 = _interopRequireDefault(_isArray);
var _noop = require('lodash/noop');
var _noop2 = _interopRequireDefault(_noop);
var _once = require('./internal/once');
var _once2 = _interopRequireDefault(_once);
var _wrapAsync = require('./internal/wrapAsync');
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
* Runs the `tasks` array of functions in parallel, without waiting until the
* previous function has completed. Once any of the `tasks` complete or pass an
* error to its callback, the main `callback` is immediately called. It's
* equivalent to `Promise.race()`.
*
* @name race
* @static
* @memberOf module:ControlFlow
* @method
* @category Control Flow
* @param {Array} tasks - An array containing [async functions]{@link AsyncFunction}
* to run. Each function can complete with an optional `result` value.
* @param {Function} callback - A callback to run once any of the functions have
* completed. This function gets an error or result from the first function that
* completed. Invoked with (err, result).
* @returns undefined
* @example
*
* async.race([
* function(callback) {
* setTimeout(function() {
* callback(null, 'one');
* }, 200);
* },
* function(callback) {
* setTimeout(function() {
* callback(null, 'two');
* }, 100);
* }
* ],
* // main callback
* function(err, result) {
* // the result will be equal to 'two' as it finishes earlier
* });
*/
function race(tasks, callback) {
callback = (0, _once2.default)(callback || _noop2.default);
if (!(0, _isArray2.default)(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
if (!tasks.length) return callback();
for (var i = 0, l = tasks.length; i < l; i++) {
(0, _wrapAsync2.default)(tasks[i])(callback);
}
}
module.exports = exports['default'];