1_using_angularfire.js

// with AngularFire
app.controller('ctrl', function($scope, $firebase) {
   $scope.list = $firebase(new Firebase(URL)); 
});

2_with_raw_firebase.js

// without AngularFire
app.controller('ctrl', function($scope, $timeout, $q) {
   $scope.list = {};
   var ref = new Firebase(URL);

   ref.on('child_added', function(snap, prevChild) {
      // ignoring prevChild, that's an additional 20-30 lines for functionality
      updateData(snap);
   });

   ref.on('child_removed', function(snap) {
      delete $scope.list[snap.name()];
   });

   ref.on('child_moved', function(snap) {
      // skipped for for brevity, add about 20-30 lines for this functionality
   });

   ref.on('child_changed', function(snap) {
      updateData(snap);
   });

   $scope.list.$save = function(key, value) {
      var def = $q.defer();
      var childRef = ref;
      if( key ) { childRef = childRef.child(key); }
      // there's some additional complexity to getting these promises
      // to work with the compiler; we'll skip those for this example
      childRef.set(value, function(err) { if( err ) { def.reject(err); } else { def.resolve(childRef) } );
      return def.promise;
   };

   $scope.list.$remove = function(key, value) {
      var def = $q.defer();
      var childRef = ref;
      if( key ) { childRef = childRef.child(key); }
      // there's some additional complexity to getting these promises
      // to work with the compiler; we'll skip those for this example
      childRef.remove(function(err) { if( err ) { def.reject(err); } else { def.resolve(childRef) } );
      return def.promise;
   };

   $scope.list.$update = function(key, value) {
      var def = $q.defer();
      var childRef = ref;
      if( key ) { childRef = childRef.child(key); }
      // there's some additional complexity to getting these promises
      // to work with the compiler; we'll skip those for this example
      childRef.set(value, function(err) { if( err ) { def.reject(err); } else { def.resolve(childRef) } );
      return def.promise;
   };

   $scope.list.$add = function(data) {
      var def = $q.defer();
      var childRef = ref.push();
      childRef.set(value, function(err) { if( err ) { def.reject(err); } else { def.resolve(childRef) } );
      return def.promise;
   };

   function updateData(snap) {
      $timeout(function() {
         var key = snap.name();
         var dat = snap.val();
         if( !$scope.list.hasOwnProperty(key) ) {
            $scope.list[key] = { $id: key };
         }
         if( !angular.isObject(dat) ) { dat = { '$value': dat }; }
         angular.forEach($scope.list, function(v,k) {
            if( !dat.hasOwnProperty(k) && !k.match(/^$/) ) {
               delete $scope.list[k];
            }
         });
         angular.extend($scope.list[k], dat);
         $scope.list[key].$priority = snap.getPriority();
      });
   }

});