feat(Change Detector): Add support for collection content watch

modules/facade/src/collection.dart

@@ -51,7 +51,7 @@ class ListWrapper {
   static filter(List list, fn) => list.where(fn).toList();
   static find(List list, fn) => list.firstWhere(fn, orElse:() => null);
   static any(List list, fn) => list.any(fn);
-  static forEach(list, fn) {
+  static forEach(list, Function fn) {
     list.forEach(fn);
   }
   static reduce(List list, Function fn, init) {
@@ -68,6 +68,15 @@ class ListWrapper {
   static void clear(List l) { l.clear(); }
 }
 
+bool isListLikeIterable(obj) => obj is Iterable;
+
+void iterateListLike(iter, Function fn) {
+  assert(iter is Iterable);
+  for (var item in iter) {
+    fn (item);
+  }
+}
+
 class SetWrapper {
   static Set createFromList(List l) { return new Set.from(l); }
   static bool has(Set s, key) { return s.contains(key); }

modules/facade/src/collection.es6

@@ -1,4 +1,4 @@
-import {int} from 'facade/lang';
+import {int, isJsObject} from 'facade/lang';
 
 export var List = window.Array;
 export var Map = window.Map;
@@ -25,12 +25,17 @@ export class MapWrapper {
   static clear(m) { m.clear(); }
 }
 
-// TODO: cannot export StringMap as a type as Dart does not support
-// renaming types...
+// TODO: cannot export StringMap as a type as Dart does not support renaming types...
+/**
+ * Wraps Javascript Objects
+ */
 export class StringMapWrapper {
-  // Note: We are not using Object.create(null) here due to
-  // performance!
-  static create():Object { return { }; }
+  static create():Object {
+    // Note: We are not using Object.create(null) here due to
+    // performance!
+    // http://jsperf.com/ng2-object-create-null
+    return { };
+  }
   static get(map, key) {
     return map.hasOwnProperty(key) ? map[key] : undefined;
   }
@@ -45,7 +50,9 @@ export class StringMapWrapper {
   }
   static forEach(map, callback) {
     for (var prop in map) {
-      callback(map[prop], prop);
+      if (map.hasOwnProperty(prop)) {
+        callback(map[prop], prop);
+      }
     }
   }
 }
@@ -117,6 +124,19 @@ export class ListWrapper {
   }
 }
 
+export function isListLikeIterable(obj):boolean {
+  if (!isJsObject(obj)) return false;
+  return ListWrapper.isList(obj) ||
+         (!(obj instanceof Map) &&  // JS Map are iterables but return entries as [k, v]
+         Symbol.iterator in obj);   // JS Iterable have a Symbol.iterator prop
+}
+
+export function iterateListLike(obj, fn:Function) {
+  for (var item of obj) {
+    fn(item);
+  }
+}
+
 export class SetWrapper {
   static createFromList(lst:List) { return new Set(lst); }
   static has(s:Set, key):boolean { return s.has(key); }

modules/facade/src/lang.dart

@@ -161,6 +161,11 @@ dynamic getMapKey(value) {
   return value.isNaN ? _NAN_KEY : value;
 }
 
-normalizeBlank(obj) {
+dynamic normalizeBlank(obj) {
   return isBlank(obj) ? null : obj;
 }
+
+bool isJsObject(o) {
+  return false;
+}
+

modules/facade/src/lang.es6

@@ -202,3 +202,7 @@ export function getMapKey(value) {
 export function normalizeBlank(obj) {
   return isBlank(obj) ? null : obj;
 }
+
+export function isJsObject(o):boolean {
+  return o !== null && (typeof o === "function" || typeof o === "object");
+}