Fix prototype oddities

src/Block.ts

@@ -113,7 +113,9 @@ export class Block {
                         this._updateViewValue(binding, bindingType, binding.desc[bindingType]);
                     } else {
                         for (var bindingDest in binding.desc[bindingType]) {
-                            this._updateViewValue(binding, bindingType, binding.desc[bindingType][bindingDest], bindingDest);
+                            if (binding.desc[bindingType].hasOwnProperty(bindingDest)) {
+                                this._updateViewValue(binding, bindingType, binding.desc[bindingType][bindingDest], bindingDest);
+                            }
                         }
                     }
                 }

src/ViewModel.ts

@@ -53,7 +53,7 @@ class ViewModel {
         var hasChanged = false;
 
         for (var key in data) {
-            if (key[0] !== '_') {
+            if (data.hasOwnProperty(key) && key[0] !== '_') {
                 var oldValue = this[key];
                 var newValue = data[key];
 

test/View.test.ts

@@ -81,4 +81,16 @@ describe('View', function () {
         });
     });
 
+    describe('#_getPropTarget', function() {
+        it('should return an object', function() {
+            // The any type is there so TypeScript doesn't complain in the for loop
+            var foo: any = "0";
+            var view = new View();
+
+            for (var p in foo) {
+                assert.strictEqual(typeof view._getPropTarget(foo[p]), "object");
+            }
+        });
+    });
+
 });

test/ViewModel.test.ts

@@ -14,4 +14,30 @@ describe('ViewModel', function () {
         });
     });
 
+    describe('setData()', function() {
+        it('should set data', function() {
+            var vm = new ViewModel();
+            assert.strictEqual(vm['foo'], undefined);
+            vm.setData({foo: 'hello world'});
+            assert.strictEqual(vm['foo'], 'hello world');
+        });
+
+        it('should not set data from the prototype', function() {
+            var vm = new ViewModel();
+
+            var ParentClass = function() {
+                this.foo = 42;
+            };
+
+            var SubClass = function() {
+                this.bar = 'hello';
+            };
+
+            SubClass.prototype = new ParentClass();
+
+            vm.setData(new SubClass());
+            assert.strictEqual(vm['foo'], undefined);
+        });
+    });
+
 });