If you're using angularJS or some variant of the Q promise library, then you have a .all()
method that solves this exact problem.
var savePromises = [];
angular.forEach(models, function(model){
savePromises.push(
model.saveToServer()
)
});
$q.all(savePromises).then(
function success(results){...},
function failed(results){...}
);
see the full API:
https://github.com/kriskowal/q/wiki/API-Reference#promiseall