Extend JQuery 1.x with whenAll that handles async call functions in objects or arrays. Returns a deferred that resolves in the same structure.

JQuery1.whenAll.js

$.whenAll = function (deferreds) {
    function isPromise(fn) {
        return fn && typeof fn.then === 'function' &&
          String($.Deferred().then) === String(fn.then);
    }
    var d = $.Deferred(),
        keys = Object.keys(deferreds),
        args = keys.map(function (k) {
            return $.Deferred(function (d) {
                var fn = deferreds[k];

                (isPromise(fn) ? fn : $.Deferred(fn))
                    .done(d.resolve)
                    .fail(function (err) { d.reject(err, k); })
                ;
            });
        });

    $.when.apply(this, args)
        .done(function () {
            var resObj = {},
                resArgs = Array.prototype.slice.call(arguments);
            resArgs.forEach(function (v, i) { resObj[keys[i]] = v; });
            d.resolve(resObj);
        })
        .fail(d.reject);

    return d;
};

function genStuff (id, prob) {
  return function (d) {
    setTimeout(function () {
      if (Math.random() < (prob === undefined ? 0.5 : prop)) {
        console.log('Stuff ' + id + ' is done!');
        d.resolve(id);
      } else {
        console.log('Stuff ' + id + ' FAILED');
        d.reject(new Error());
      }
    }, Math.random() * 2000);
  };
}

var reqObj = {
  x: genStuff('x'),
  y: genStuff('y'),
  z: genStuff('z')
};
var reqArr = [genStuff(0.1), genStuff(1), genStuff(2)];

$.whenAll(reqObj)
  .done(function (res) {
    console.log('Success');
    console.log(res);
  })
  .fail(function (firstFail, name) {
    console.log('Fail for: ' + name);
    console.log(firstFail);
  });

$.whenAll(reqArr)
  .done(function (res) {
    console.log('Success');
    console.log(res);
  })
  .fail(function (firstFail, name) {
    console.log('Fail for: ' + name);
    console.log(firstFail);
  });

http://jsbin.com/nuxuciwabu/1/edit?js,console