promise.js

function resolvePending(arrayOfPromises) {
  const d = $.Deferred();
  let resolved = [];
  let rejected = [];
  const check = () => {
    if (resolved.length + rejected.length === arrayOfPromises.length) {
      rejected.length > 0 ? d.reject(rejected) : d.resolve(resolved);
    }
  };
  
  $.each(arrayOfPromises, function(i, fn) {
    fn().    
      done(res => {
        resolved = resolved.concat(res);
        check();
      }).
      fail(res => {
        rejected = rejected.concat(res);
        check();
      });
  });
  
  return d;
}

function asyncThing() {
  //return promise
}

resolvePending([asyncThing, asyncThing, asyncThing]).
  then(function(resolved) {
    console.log(resolved);
  }).
  fail(function(rejected) {
    console.log(rejected);
  });