code: function tryEach(tasks, callback) {
      var error = null;
      var result;
      return eachSeries(tasks, (task, taskCb) => {
          wrapAsync(task)((err, ...args) => {
              if (err === false) return taskCb(err);
  
              if (args.length < 2) {
                  [result] = args;
              } else {
                  result = args;
              }
              error = err;
              taskCb(err ? null : {});
          });
      }, () => callback(error, result));
  }
docs: 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|AsyncIterable|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).
  @returns {Promise} a promise, if no callback is passed
  @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.
  });