| 'use strict'; |
| |
| Object.defineProperty(exports, "__esModule", { |
| value: true |
| }); |
| exports.default = tryEach; |
| |
| var _noop = require('lodash/noop'); |
| |
| var _noop2 = _interopRequireDefault(_noop); |
| |
| var _eachSeries = require('./eachSeries'); |
| |
| var _eachSeries2 = _interopRequireDefault(_eachSeries); |
| |
| var _wrapAsync = require('./internal/wrapAsync'); |
| |
| var _wrapAsync2 = _interopRequireDefault(_wrapAsync); |
| |
| var _slice = require('./internal/slice'); |
| |
| var _slice2 = _interopRequireDefault(_slice); |
| |
| function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
| |
| /** |
| * It runs each task in series but stops whenever any of the functions were |
| * successful. If one of the tasks were successful, the `callback` will be |
| * passed the result of the successful task. If all tasks fail, the callback |
| * will be passed the error and result (if any) of the final attempt. |
| * |
| * @name tryEach |
| * @static |
| * @memberOf module:ControlFlow |
| * @method |
| * @category Control Flow |
| * @param {Array|Iterable|Object} tasks - A collection containing functions to |
| * run, each function is passed a `callback(err, result)` it must call on |
| * completion with an error `err` (which can be `null`) and an optional `result` |
| * value. |
| * @param {Function} [callback] - An optional callback which is called when one |
| * of the tasks has succeeded, or all have failed. It receives the `err` and |
| * `result` arguments of the last attempt at completing the `task`. Invoked with |
| * (err, results). |
| * @example |
| * async.tryEach([ |
| * function getDataFromFirstWebsite(callback) { |
| * // Try getting the data from the first website |
| * callback(err, data); |
| * }, |
| * function getDataFromSecondWebsite(callback) { |
| * // First website failed, |
| * // Try getting the data from the backup website |
| * callback(err, data); |
| * } |
| * ], |
| * // optional callback |
| * function(err, results) { |
| * Now do something with the data. |
| * }); |
| * |
| */ |
| function tryEach(tasks, callback) { |
| var error = null; |
| var result; |
| callback = callback || _noop2.default; |
| (0, _eachSeries2.default)(tasks, function (task, callback) { |
| (0, _wrapAsync2.default)(task)(function (err, res /*, ...args*/) { |
| if (arguments.length > 2) { |
| result = (0, _slice2.default)(arguments, 1); |
| } else { |
| result = res; |
| } |
| error = err; |
| callback(!err); |
| }); |
| }, function () { |
| callback(error, result); |
| }); |
| } |
| module.exports = exports['default']; |