Haxe callback vs. promises

cheeseburger.hx

Page.all(function(err:NodeErr, records:Array<Page>){
  if(err != null) throw err;
  for(page in pages){
    trace(page);
  }
})

promhx.hx

// Long
      var pages = new Deferred<Array<Page>>();
      var prom = pages.promise();
      prom.then(function(val:Array<Page>){
        for(page in pages){
          trace(page);
        }
      });
      prom.catchError(function(err){
        throw err;
      });
      pages.resolve(Page.all());

// Short
      var pages = new Deferred<Array<Page>>();
      pages
        .promise()
        .then(function(val:Array<Page>){
          for(page in pages){
            trace(page);
          }
        })
        .catchError(function(err){
          throw err;
        });
      
      pages.resolve(Page.all());