Promises

promises.js

// with promise
app.controller('FooCtrl', ['$scope', 'rpc', function ($scope, rpc) {
  var promise = rpc.exec('foo.get');
  promise.then(
    /* success */ function (foos) { console.log('got some foos', foos); },
    /* failure */ function (err) { conosle.log('got an error', err); }
  );
}]);

// without a promise
app.controller('FooCtrl', ['$scope', 'rpc', function ($scope, rpc) {
  rpc.exec('foo.get', function (err, foos) {
    if (err) { return console.log('got an error', err); }
    console.log('got some foos', foos);
  });
}]);