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

modules/change_detection/src/array_changes.js

@@ -1,4 +1,6 @@
 import {
+  isListLikeIterable,
+  iterateListLike,
   ListWrapper,
   MapWrapper
 } from 'facade/collection';
@@ -12,20 +14,21 @@ import {
   looseIdentical,
 } from 'facade/lang';
 
-export class CollectionChanges {
+export class ArrayChanges {
   _collection;
   _length:int;
   _linkedRecords:_DuplicateMap;
   _unlinkedRecords:_DuplicateMap;
-  _previousItHead:CollectionChangeRecord<V> ;
+  _previousItHead:CollectionChangeRecord<V>;
   _itHead:CollectionChangeRecord<V>;
-  _itTail:CollectionChangeRecord<V> ;
+  _itTail:CollectionChangeRecord<V>;
   _additionsHead:CollectionChangeRecord<V>;
-  _additionsTail:CollectionChangeRecord<V> ;
+  _additionsTail:CollectionChangeRecord<V>;
   _movesHead:CollectionChangeRecord<V>;
   _movesTail:CollectionChangeRecord<V> ;
   _removalsHead:CollectionChangeRecord<V>;
-  _removalsTail:CollectionChangeRecord<V> ;
+  _removalsTail:CollectionChangeRecord<V>;
+
   constructor() {
     this._collection = null;
     this._length = null;
@@ -45,6 +48,10 @@ export class CollectionChanges {
     this._removalsTail = null;
   }
 
+  static supports(obj):boolean {
+    return isListLikeIterable(obj);
+  }
+
   get collection() {
     return this._collection;
   }
@@ -112,8 +119,19 @@ export class CollectionChanges {
         record = record._next;
       }
     } else {
-      // todo(vicb) implement iterators
+      index = 0;
-      throw "NYI";
+      iterateListLike(collection, (item) => {
+        if (record === null || !looseIdentical(record.item, item)) {
+          record = this._mismatch(record, item, index);
+          mayBeDirty = true;
+        } else if (mayBeDirty) {
+          // TODO(misko): can we limit this to duplicates only?
+          record = this._verifyReinsertion(record, item, index);
+        }
+        record = record._next;
+        index++
+      });
+      this._length = index;
     }
 
     this._truncate(record);

modules/change_detection/src/keyvalue_changes.js

@@ -1,19 +1,19 @@
-import {ListWrapper, MapWrapper} from 'facade/collection';
+import {ListWrapper, MapWrapper, StringMapWrapper} from 'facade/collection';
 
-import {stringify, looseIdentical} from 'facade/lang';
+import {stringify, looseIdentical, isJsObject} from 'facade/lang';
 
-export class MapChanges {
+export class KeyValueChanges {
   _records:Map;
-  _map:Map;
+  _map:any;
 
-  _mapHead:MapChangeRecord;
+  _mapHead:KVChangeRecord;
-  _previousMapHead:MapChangeRecord;
+  _previousMapHead:KVChangeRecord;
-  _changesHead:MapChangeRecord;
+  _changesHead:KVChangeRecord;
-  _changesTail:MapChangeRecord;
+  _changesTail:KVChangeRecord;
-  _additionsHead:MapChangeRecord;
+  _additionsHead:KVChangeRecord;
-  _additionsTail:MapChangeRecord;
+  _additionsTail:KVChangeRecord;
-  _removalsHead:MapChangeRecord;
+  _removalsHead:KVChangeRecord;
-  _removalsTail:MapChangeRecord;
+  _removalsTail:KVChangeRecord;
 
   constructor() {
     this._records = MapWrapper.create();
@@ -28,6 +28,10 @@ export class MapChanges {
     this._removalsTail = null;
   }
 
+  static supports(obj):boolean {
+    return obj instanceof Map || isJsObject(obj);
+  }
+
   get isDirty():boolean {
     return this._additionsHead !== null ||
            this._changesHead !== null ||
@@ -35,35 +39,35 @@ export class MapChanges {
   }
 
   forEachItem(fn:Function) {
-      var record:MapChangeRecord;
+    var record:KVChangeRecord;
     for (record = this._mapHead; record !== null; record = record._next) {
       fn(record);
     }
   }
 
   forEachPreviousItem(fn:Function) {
-      var record:MapChangeRecord;
+    var record:KVChangeRecord;
     for (record = this._previousMapHead; record !== null; record = record._nextPrevious) {
       fn(record);
     }
   }
 
   forEachChangedItem(fn:Function) {
-      var record:MapChangeRecord;
+    var record:KVChangeRecord;
     for (record = this._changesHead; record !== null; record = record._nextChanged) {
       fn(record);
     }
   }
 
   forEachAddedItem(fn:Function){
-      var record:MapChangeRecord;
+    var record:KVChangeRecord;
     for (record = this._additionsHead; record !== null; record = record._nextAdded) {
       fn(record);
     }
   }
 
   forEachRemovedItem(fn:Function){
-      var record:MapChangeRecord;
+    var record:KVChangeRecord;
     for (record = this._removalsHead; record !== null; record = record._nextRemoved) {
       fn(record);
     }
@@ -73,12 +77,12 @@ export class MapChanges {
     this._reset();
     this._map = map;
     var records = this._records;
-    var oldSeqRecord:MapChangeRecord = this._mapHead;
+    var oldSeqRecord:KVChangeRecord = this._mapHead;
-    var lastOldSeqRecord:MapChangeRecord = null;
+    var lastOldSeqRecord:KVChangeRecord = null;
-    var lastNewSeqRecord:MapChangeRecord = null;
+    var lastNewSeqRecord:KVChangeRecord = null;
     var seqChanged:boolean = false;
 
-    MapWrapper.forEach(map, (value, key) => {
+    this._forEach(map, (value, key) => {
       var newSeqRecord;
       if (oldSeqRecord !== null && key === oldSeqRecord.key) {
         newSeqRecord = oldSeqRecord;
@@ -97,7 +101,7 @@ export class MapChanges {
         if (MapWrapper.contains(records, key)) {
           newSeqRecord = MapWrapper.get(records, key);
         } else {
-          newSeqRecord = new MapChangeRecord(key);
+          newSeqRecord = new KVChangeRecord(key);
           MapWrapper.set(records, key, newSeqRecord);
           newSeqRecord._currentValue = value;
           this._addToAdditions(newSeqRecord);
@@ -124,7 +128,7 @@ export class MapChanges {
 
   _reset() {
     if (this.isDirty) {
-      var record:MapChangeRecord;
+      var record:KVChangeRecord;
       // Record the state of the mapping
       for (record = this._previousMapHead = this._mapHead;
            record !== null;
@@ -171,7 +175,7 @@ export class MapChanges {
     }
   }
 
-  _truncate(lastRecord:MapChangeRecord, record:MapChangeRecord) {
+  _truncate(lastRecord:KVChangeRecord, record:KVChangeRecord) {
     while (record !== null) {
       if (lastRecord === null) {
         this._mapHead = null;
@@ -189,20 +193,20 @@ export class MapChanges {
       record = nextRecord;
     }
 
-    for (var rec:MapChangeRecord = this._removalsHead; rec !== null; rec = rec._nextRemoved) {
+    for (var rec:KVChangeRecord = this._removalsHead; rec !== null; rec = rec._nextRemoved) {
       rec._previousValue = rec._currentValue;
       rec._currentValue = null;
       MapWrapper.delete(this._records, rec.key);
     }
   }
 
-  _isInRemovals(record:MapChangeRecord) {
+  _isInRemovals(record:KVChangeRecord) {
     return record === this._removalsHead ||
            record._nextRemoved !== null ||
            record._prevRemoved !== null;
   }
 
-  _addToRemovals(record:MapChangeRecord) {
+  _addToRemovals(record:KVChangeRecord) {
     // todo(vicb) assert
     //assert(record._next == null);
     //assert(record._nextAdded == null);
@@ -218,7 +222,7 @@ export class MapChanges {
     }
   }
 
-  _removeFromSeq(prev:MapChangeRecord, record:MapChangeRecord) {
+  _removeFromSeq(prev:KVChangeRecord, record:KVChangeRecord) {
     var next = record._next;
     if (prev === null) {
       this._mapHead = next;
@@ -232,7 +236,7 @@ export class MapChanges {
     //})());
   }
 
-  _removeFromRemovals(record:MapChangeRecord) {
+  _removeFromRemovals(record:KVChangeRecord) {
     // todo(vicb) assert
     //assert(record._next == null);
     //assert(record._nextAdded == null);
@@ -253,7 +257,7 @@ export class MapChanges {
     record._prevRemoved = record._nextRemoved = null;
   }
 
-  _addToAdditions(record:MapChangeRecord) {
+  _addToAdditions(record:KVChangeRecord) {
     // todo(vicb): assert
     //assert(record._next == null);
     //assert(record._nextAdded == null);
@@ -268,7 +272,7 @@ export class MapChanges {
     }
   }
 
-  _addToChanges(record:MapChangeRecord) {
+  _addToChanges(record:KVChangeRecord) {
     // todo(vicb) assert
     //assert(record._nextAdded == null);
     //assert(record._nextChanged == null);
@@ -288,7 +292,7 @@ export class MapChanges {
     var changes = [];
     var additions = [];
     var removals = [];
-    var record:MapChangeRecord;
+    var record:KVChangeRecord;
 
     for (record = this._mapHead; record !== null; record = record._next) {
       ListWrapper.push(items, stringify(record));
@@ -312,19 +316,29 @@ export class MapChanges {
            "changes: " + changes.join(', ') + "\n" +
            "removals: " + removals.join(', ') + "\n";
   }
+
+  _forEach(obj, fn:Function) {
+    if (obj instanceof Map) {
+      MapWrapper.forEach(obj, fn);
+    } else {
+      StringMapWrapper.forEach(obj, fn);
+    }
+  }
 }
 
-export class MapChangeRecord {
+
+
+export class KVChangeRecord {
   key;
   _previousValue;
   _currentValue;
 
-  _nextPrevious:MapChangeRecord;
+  _nextPrevious:KVChangeRecord;
-  _next:MapChangeRecord;
+  _next:KVChangeRecord;
-  _nextAdded:MapChangeRecord;
+  _nextAdded:KVChangeRecord;
-  _nextRemoved:MapChangeRecord;
+  _nextRemoved:KVChangeRecord;
-  _prevRemoved:MapChangeRecord;
+  _prevRemoved:KVChangeRecord;
-  _nextChanged:MapChangeRecord;
+  _nextChanged:KVChangeRecord;
 
   constructor(key) {
     this.key = key;
@@ -345,5 +359,4 @@ export class MapChangeRecord {
       (stringify(this.key) + '[' + stringify(this._previousValue) + '->' +
         stringify(this._currentValue) + ']');
   }
-
 }

modules/change_detection/src/parser/ast.js

@@ -29,6 +29,21 @@ export class EmptyExpr extends AST {
   }
 }
 
+export class Collection extends AST {
+  value:AST;
+  constructor(value:AST) {
+    this.value = value;
+  }
+
+  eval(context) {
+    return value.eval(context);
+  }
+
+  visit(visitor, args) {
+    visitor.visitCollection(this, args);
+  }
+}
+
 export class ImplicitReceiver extends AST {
   eval(context) {
     return context;
@@ -386,20 +401,21 @@ export class TemplateBinding {
 
 //INTERFACE
 export class AstVisitor {
-  visitChain(ast:Chain, args){}
-  visitImplicitReceiver(ast:ImplicitReceiver, args) {}
-  visitConditional(ast:Conditional, args) {}
   visitAccessMember(ast:AccessMember, args) {}
-  visitKeyedAccess(ast:KeyedAccess, args) {}
-  visitBinary(ast:Binary, args) {}
-  visitPrefixNot(ast:PrefixNot, args) {}
-  visitLiteralPrimitive(ast:LiteralPrimitive, args) {}
-  visitFormatter(ast:Formatter, args) {}
   visitAssignment(ast:Assignment, args) {}
+  visitBinary(ast:Binary, args) {}
+  visitChain(ast:Chain, args){}
+  visitCollection(ast:Collection, args) {}
+  visitConditional(ast:Conditional, args) {}
+  visitFormatter(ast:Formatter, args) {}
+  visitFunctionCall(ast:FunctionCall, args) {}
+  visitImplicitReceiver(ast:ImplicitReceiver, args) {}
+  visitKeyedAccess(ast:KeyedAccess, args) {}
   visitLiteralArray(ast:LiteralArray, args) {}
   visitLiteralMap(ast:LiteralMap, args) {}
+  visitLiteralPrimitive(ast:LiteralPrimitive, args) {}
   visitMethodCall(ast:MethodCall, args) {}
-  visitFunctionCall(ast:FunctionCall, args) {}
+  visitPrefixNot(ast:PrefixNot, args) {}
 }
 
 var _evalListCache = [[],[0],[0,0],[0,0,0],[0,0,0,0],[0,0,0,0,0]];

modules/change_detection/src/record.js

@@ -1,6 +1,8 @@
 import {ProtoRecordRange, RecordRange} from './record_range';
 import {FIELD, isPresent, isBlank, int, StringWrapper, FunctionWrapper, BaseException} from 'facade/lang';
 import {List, Map, ListWrapper, MapWrapper} from 'facade/collection';
+import {ArrayChanges} from './array_changes';
+import {KeyValueChanges} from './keyvalue_changes';
 
 var _fresh = new Object();
 
@@ -10,15 +12,15 @@ export const RECORD_TYPE_INVOKE_CLOSURE = 0x0001;
 export const RECORD_TYPE_INVOKE_FORMATTER = 0x0002;
 export const RECORD_TYPE_INVOKE_METHOD = 0x0003;
 export const RECORD_TYPE_INVOKE_PURE_FUNCTION = 0x0004;
-export const RECORD_TYPE_LIST = 0x0005;
+const RECORD_TYPE_ARRAY = 0x0005;
-export const RECORD_TYPE_MAP = 0x0006;
+const RECORD_TYPE_KEY_VALUE = 0x0006;
-export const RECORD_TYPE_MARKER = 0x0007;
+const RECORD_TYPE_MARKER = 0x0007;
 export const RECORD_TYPE_PROPERTY = 0x0008;
+const RECORD_TYPE_NULL= 0x0009;
 
 const RECORD_FLAG_DISABLED = 0x0100;
 export const RECORD_FLAG_IMPLICIT_RECEIVER = 0x0200;
-
+export const RECORD_FLAG_COLLECTION = 0x0400;
-
 
 /**
  * For now we are dropping expression coalescence. We can always add it later, but
@@ -112,7 +114,6 @@ export class Record {
     this.dest = null;
 
     this.previousValue = null;
-    this.currentValue = _fresh;
 
     this.context = null;
     this.funcOrValue = null;
@@ -125,6 +126,11 @@ export class Record {
 
     this._mode = protoRecord._mode;
 
+    // Return early for collections, further init delayed until updateContext()
+    if (this.isCollection) return;
+
+    this.currentValue = _fresh;
+
     var type = this.type;
 
     if (type === RECORD_TYPE_CONST) {
@@ -150,15 +156,21 @@ export class Record {
     }
   }
 
-  get type() {
+  // todo(vicb): getter / setters are much slower than regular methods
+  // todo(vicb): update the whole code base
+  get type():int {
     return this._mode & RECORD_TYPE_MASK;
   }
 
-  get disabled() {
+  set type(value:int) {
+    this._mode = (this._mode & ~RECORD_TYPE_MASK) | value;
+  }
+
+  get disabled():boolean {
     return (this._mode & RECORD_FLAG_DISABLED) === RECORD_FLAG_DISABLED;
   }
 
-  set disabled(value) {
+  set disabled(value:boolean) {
     if (value) {
       this._mode |= RECORD_FLAG_DISABLED;
     } else {
@@ -166,24 +178,34 @@ export class Record {
     }
   }
 
-  get isImplicitReceiver() {
+  get isImplicitReceiver():boolean {
     return (this._mode & RECORD_FLAG_IMPLICIT_RECEIVER) === RECORD_FLAG_IMPLICIT_RECEIVER;
   }
 
-  static createMarker(rr:RecordRange) {
+  get isCollection():boolean {
+    return (this._mode & RECORD_FLAG_COLLECTION) === RECORD_FLAG_COLLECTION;
+  }
+
+  static createMarker(rr:RecordRange):Record {
     return new Record(rr, null, null);
   }
 
   check():boolean {
+    if (this.isCollection) {
+      var changed = this._checkCollection();
+      if (changed) {
+        this._notifyDispatcher();
+        return true;
+      }
+      return false;
+    } else {
       this.previousValue = this.currentValue;
       this.currentValue = this._calculateNewValue();
-
       if (isSame(this.previousValue, this.currentValue)) return false;
-
       this._updateDestination();
-
       return true;
     }
+  }
 
   _updateDestination() {
     // todo(vicb): compute this info only once in ctor ? (add a bit in mode not to grow the mem req)
@@ -194,13 +216,38 @@ export class Record {
         this.dest.updateContext(this.currentValue);
       }
     } else {
+      this._notifyDispatcher();
+    }
+  }
+
+  _notifyDispatcher() {
     this.recordRange.dispatcher.onRecordChange(this, this.protoRecord.dest);
   }
+
+  // return whether the content has changed
+  _checkCollection():boolean {
+    switch(this.type) {
+      case RECORD_TYPE_KEY_VALUE:
+        var kvChangeDetector:KeyValueChanges = this.currentValue;
+        return kvChangeDetector.check(this.context);
+
+      case RECORD_TYPE_ARRAY:
+        var arrayChangeDetector:ArrayChanges = this.currentValue;
+        return arrayChangeDetector.check(this.context);
+
+      case RECORD_TYPE_NULL:
+        // no need to check the content again unless the context changes
+        this.recordRange.disableRecord(this);
+        this.currentValue = null;
+        return true;
+
+      default:
+        throw new BaseException(`Unsupported record type (${this.type})`);
+    }
   }
 
   _calculateNewValue() {
-    var type = this.type;
+    switch (this.type) {
-    switch (type) {
       case RECORD_TYPE_PROPERTY:
         return this.funcOrValue(this.context);
 
@@ -219,17 +266,8 @@ export class Record {
         this.recordRange.disableRecord(this);
         return this.funcOrValue;
 
-      case RECORD_TYPE_MARKER:
-        throw new BaseException('Marker not implemented');
-
-      case RECORD_TYPE_MAP:
-        throw new BaseException('Map not implemented');
-
-      case RECORD_TYPE_LIST:
-        throw new BaseException('List not implemented');
-
       default:
-        throw new BaseException(`Unsupported record type ($type)`);
+        throw new BaseException(`Unsupported record type (${this.type})`);
     }
   }
 
@@ -241,6 +279,34 @@ export class Record {
   updateContext(value) {
     this.context = value;
     this.recordRange.enableRecord(this);
+
+    if (!this.isMarkerRecord) {
+      this.recordRange.enableRecord(this);
+    }
+
+    if (this.isCollection) {
+      if (ArrayChanges.supports(value)) {
+        if (this.type != RECORD_TYPE_ARRAY) {
+          this.type = RECORD_TYPE_ARRAY;
+          this.currentValue = new ArrayChanges();
+        }
+        return;
+      }
+
+      if (KeyValueChanges.supports(value)) {
+        if (this.type != RECORD_TYPE_KEY_VALUE) {
+          this.type = RECORD_TYPE_KEY_VALUE;
+          this.currentValue = new KeyValueChanges();
+        }
+        return;
+      }
+
+      if (isBlank(value)) {
+        this.type = RECORD_TYPE_NULL;
+      } else {
+        throw new BaseException("Collection records must be array like, map like or null");
+      }
+    }
   }
 
   get isMarkerRecord() {

modules/change_detection/src/record_range.js

@@ -1,6 +1,7 @@
 import {
   ProtoRecord,
   Record,
+  RECORD_FLAG_COLLECTION,
   RECORD_FLAG_IMPLICIT_RECEIVER,
   RECORD_TYPE_CONST,
   RECORD_TYPE_INVOKE_CLOSURE,
@@ -13,10 +14,26 @@ import {
 import {FIELD, IMPLEMENTS, isBlank, isPresent, int, toBool, autoConvertAdd, BaseException,
   NumberWrapper} from 'facade/lang';
 import {List, Map, ListWrapper, MapWrapper} from 'facade/collection';
-import {AST, AccessMember, ImplicitReceiver, AstVisitor, LiteralPrimitive,
-  Binary, Formatter, MethodCall, FunctionCall, PrefixNot, Conditional,
-  LiteralArray, LiteralMap, KeyedAccess, Chain, Assignment} from './parser/ast';
 import {ContextWithVariableBindings} from './parser/context_with_variable_bindings';
+import {
+  AccessMember,
+  Assignment,
+  AST,
+  AstVisitor,
+  Binary,
+  Chain,
+  Collection,
+  Conditional,
+  Formatter,
+  FunctionCall,
+  ImplicitReceiver,
+  KeyedAccess,
+  LiteralArray,
+  LiteralMap,
+  LiteralPrimitive,
+  MethodCall,
+  PrefixNot
+} from './parser/ast';
 
 export class ProtoRecordRange {
   headRecord:ProtoRecord;
@@ -32,13 +49,16 @@ export class ProtoRecordRange {
    * @param ast The expression to watch
    * @param memento an opaque object which will be passed to WatchGroupDispatcher on
    *        detecting a change.
-   * @param shallow Should collections be shallow watched
+   * @param content Wether to watch collection content (true) or reference (false, default)
    */
   addRecordsFromAST(ast:AST,
         memento,
-        shallow = false)
+        content:boolean = false)
   {
     var creator = new ProtoRecordCreator(this);
+    if (content) {
+      ast = new Collection(ast);
+    }
     creator.createRecordsFromAST(ast, memento);
     this._addRecords(creator.headRecord, creator.tailRecord);
   }
@@ -436,6 +456,12 @@ class ProtoRecordCreator {
     this.add(record);
   }
 
+  visitCollection(ast: Collection, dest) {
+    var record = this.construct(RECORD_FLAG_COLLECTION, null, null, null, dest);
+    ast.value.visit(this, new Destination(record, null));
+    this.add(record);
+  }
+
   visitConditional(ast:Conditional, dest) {
     var record = this.construct(RECORD_TYPE_INVOKE_PURE_FUNCTION, _cond, 3, null, dest);
     ast.condition.visit(this, new Destination(record, 0));

modules/change_detection/test/array_changes_spec.js

@@ -1,13 +1,11 @@
 import {describe, it, iit, xit, expect, beforeEach, afterEach} from 'test_lib/test_lib';
-
+import {ArrayChanges} from 'change_detection/array_changes';
-import {CollectionChanges} from 'change_detection/collection_changes';
+import {NumberWrapper} from 'facade/lang';
-
+import {ListWrapper, MapWrapper} from 'facade/collection';
-import {isBlank, NumberWrapper} from 'facade/lang';
+import {TestIterable} from './iterable';
-
+import {arrayChangesAsString} from './util';
-import {ListWrapper} from 'facade/collection';
 
 // todo(vicb): UnmodifiableListView / frozen object when implemented
-// todo(vicb): Update the code & tests for object equality
 export function main() {
   describe('collection_changes', function() {
     describe('CollectionChanges', function() {
@@ -15,30 +13,62 @@ export function main() {
       var l;
 
       beforeEach(() => {
-        changes = new CollectionChanges();
+        changes = new ArrayChanges();
       });
 
       afterEach(() => {
         changes = null;
       });
 
+      it('should support list and iterables', () => {
+        expect(ArrayChanges.supports([])).toBeTruthy();
+        expect(ArrayChanges.supports(new TestIterable())).toBeTruthy();
+        expect(ArrayChanges.supports(MapWrapper.create())).toBeFalsy();
+        expect(ArrayChanges.supports(null)).toBeFalsy();
+      });
+
+      it('should support iterables', () => {
+        l = new TestIterable();
+
+        changes.check(l);
+        expect(changes.toString()).toEqual(arrayChangesAsString({
+          collection: []
+        }));
+
+        l.list = [1];
+        changes.check(l);
+        expect(changes.toString()).toEqual(arrayChangesAsString({
+          collection: ['1[null->0]'],
+          additions: ['1[null->0]']
+        }));
+
+        l.list = [2, 1];
+        changes.check(l);
+        expect(changes.toString()).toEqual(arrayChangesAsString({
+          collection: ['2[null->0]', '1[0->1]'],
+          previous: ['1[0->1]'],
+          additions: ['2[null->0]'],
+          moves: ['1[0->1]']
+        }));
+      });
+
       it('should detect additions', () => {
         l = [];
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: []
         }));
 
         ListWrapper.push(l, 'a');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a[null->0]'],
           additions: ['a[null->0]']
         }));
 
         ListWrapper.push(l, 'b');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'b[null->1]'],
           previous: ['a'],
           additions: ['b[null->1]']
@@ -51,7 +81,7 @@ export function main() {
 
         l = [1, 0];
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['1[null->0]', '0[0->1]'],
           previous: ['0[0->1]'],
           additions: ['1[null->0]'],
@@ -60,7 +90,7 @@ export function main() {
 
         l = [2, 1, 0];
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['2[null->0]', '1[0->1]', '0[1->2]'],
           previous: ['1[0->1]', '0[1->2]'],
           additions: ['2[null->0]'],
@@ -76,7 +106,7 @@ export function main() {
         ListWrapper.push(l, 2);
         ListWrapper.push(l, 1);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['2[1->0]', '1[0->1]'],
           previous: ['1[0->1]', '2[1->0]'],
           moves: ['2[1->0]', '1[0->1]']
@@ -90,7 +120,7 @@ export function main() {
         ListWrapper.removeAt(l, 1);
         ListWrapper.insert(l, 0, 'b');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['b[1->0]', 'a[0->1]', 'c'],
           previous: ['a[0->1]', 'b[1->0]', 'c'],
           moves: ['b[1->0]', 'a[0->1]']
@@ -99,7 +129,7 @@ export function main() {
         ListWrapper.removeAt(l, 1);
         ListWrapper.push(l, 'a');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['b', 'c[2->1]', 'a[1->2]'],
           previous: ['b', 'a[1->2]', 'c[2->1]'],
           moves: ['c[2->1]', 'a[1->2]']
@@ -112,14 +142,14 @@ export function main() {
 
         ListWrapper.push(l, 'a');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a[null->0]'],
           additions: ['a[null->0]']
         }));
 
         ListWrapper.push(l, 'b');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'b[null->1]'],
           previous: ['a'],
           additions: ['b[null->1]']
@@ -128,7 +158,7 @@ export function main() {
         ListWrapper.push(l, 'c');
         ListWrapper.push(l, 'd');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'b', 'c[null->2]', 'd[null->3]'],
           previous: ['a', 'b'],
           additions: ['c[null->2]', 'd[null->3]']
@@ -136,7 +166,7 @@ export function main() {
 
         ListWrapper.removeAt(l, 2);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'b', 'd[3->2]'],
           previous: ['a', 'b', 'c[2->null]', 'd[3->2]'],
           moves: ['d[3->2]'],
@@ -149,7 +179,7 @@ export function main() {
         ListWrapper.push(l, 'b');
         ListWrapper.push(l, 'a');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['d[2->0]', 'c[null->1]', 'b[1->2]', 'a[0->3]'],
           previous: ['a[0->3]', 'b[1->2]', 'd[2->0]'],
           additions: ['c[null->1]'],
@@ -165,7 +195,7 @@ export function main() {
         var oo = 'oo';
         ListWrapper.set(l, 1, b + oo);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'boo'],
           previous: ['a', 'boo']
         }));
@@ -175,7 +205,7 @@ export function main() {
         l = [NumberWrapper.NaN];
         changes.check(l);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: [NumberWrapper.NaN],
           previous: [NumberWrapper.NaN]
         }));
@@ -187,7 +217,7 @@ export function main() {
 
         ListWrapper.insert(l, 0, 'foo');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
             collection: ['foo[null->0]', 'NaN[0->1]', 'NaN[1->2]'],
             previous: ['NaN[0->1]', 'NaN[1->2]'],
             additions: ['foo[null->0]'],
@@ -201,7 +231,7 @@ export function main() {
 
         ListWrapper.removeAt(l, 1);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'c[2->1]'],
           previous: ['a', 'b[1->null]', 'c[2->1]'],
           moves: ['c[2->1]'],
@@ -210,7 +240,7 @@ export function main() {
 
         ListWrapper.insert(l, 1, 'b');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'b[null->1]', 'c[1->2]'],
           previous: ['a', 'c[1->2]'],
           additions: ['b[null->1]'],
@@ -224,7 +254,7 @@ export function main() {
 
         ListWrapper.removeAt(l, 0);
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['a', 'a', 'b[3->2]', 'b[4->3]'],
           previous: ['a', 'a', 'a[2->null]', 'b[3->2]', 'b[4->3]'],
           moves: ['b[3->2]', 'b[4->3]'],
@@ -238,7 +268,7 @@ export function main() {
 
         ListWrapper.insert(l, 0, 'b');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['b[2->0]', 'a[0->1]', 'a[1->2]', 'b', 'b[null->4]'],
           previous: ['a[0->1]', 'a[1->2]', 'b[2->0]', 'b'],
           additions: ['b[null->4]'],
@@ -255,7 +285,7 @@ export function main() {
         ListWrapper.push(l, 'a');
         ListWrapper.push(l, 'c');
         changes.check(l);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(arrayChangesAsString({
           collection: ['b[1->0]', 'a[0->1]', 'c'],
           previous: ['a[0->1]', 'b[1->0]', 'c'],
           moves: ['b[1->0]', 'a[0->1]']
@@ -265,16 +295,3 @@ export function main() {
   });
 }
 
-function changesAsString({collection, previous, additions, moves, removals}) {
-  if (isBlank(collection)) collection = [];
-  if (isBlank(previous)) previous = [];
-  if (isBlank(additions)) additions = [];
-  if (isBlank(moves)) moves = [];
-  if (isBlank(removals)) removals = [];
-
-  return "collection: " + collection.join(', ') + "\n" +
-         "previous: " + previous.join(', ') + "\n" +
-         "additions: " + additions.join(', ') + "\n" +
-         "moves: " + moves.join(', ') + "\n" +
-         "removals: " + removals.join(', ') + "\n";
-}

modules/change_detection/test/change_detector_spec.js

@@ -1,10 +1,11 @@
 import {ddescribe, describe, it, iit, xit, expect} from 'test_lib/test_lib';
 
-import {isPresent} from 'facade/lang';
+import {isPresent, isBlank, isJsObject} from 'facade/lang';
 import {List, ListWrapper, MapWrapper} from 'facade/collection';
 import {ContextWithVariableBindings} from 'change_detection/parser/context_with_variable_bindings';
 import {Parser} from 'change_detection/parser/parser';
 import {Lexer} from 'change_detection/parser/lexer';
+import {arrayChangesAsString, kvChangesAsString} from './util';
 
 import {
   ChangeDetector,
@@ -22,9 +23,10 @@ export function main() {
     return parser.parseBinding(exp).ast;
   }
 
-  function createChangeDetector(memo:string, exp:string, context = null, formatters = null) {
+  function createChangeDetector(memo:string, exp:string, context = null, formatters = null,
+                                content = false) {
     var prr = new ProtoRecordRange();
-    prr.addRecordsFromAST(ast(exp), memo, false);
+    prr.addRecordsFromAST(ast(exp), memo, content);
 
     var dispatcher = new LoggingDispatcher();
     var rr = prr.instantiate(dispatcher, formatters);
@@ -35,8 +37,9 @@ export function main() {
     return {"changeDetector" : cd, "dispatcher" : dispatcher};
   }
 
-  function executeWatch(memo:string, exp:string, context = null, formatters = null) {
+  function executeWatch(memo:string, exp:string, context = null, formatters = null,
-    var res = createChangeDetector(memo, exp, context, formatters);
+                        content = false) {
+    var res = createChangeDetector(memo, exp, context, formatters, content);
     res["changeDetector"].detectChanges();
     return res["dispatcher"].log;
   }
@@ -194,6 +197,7 @@ export function main() {
         });
       });
 
+
       describe("ContextWithVariableBindings", () => {
         it('should read a field from ContextWithVariableBindings', () => {
           var locals = new ContextWithVariableBindings(null,
@@ -221,6 +225,124 @@ export function main() {
             .toEqual(['name=Jim']);
         });
       });
+
+      describe("collections", () => {
+        it("should support null values", () => {
+          var context = new TestData(null);
+          var c = createChangeDetector('a', 'a', context, null, true);
+          var cd = c["changeDetector"];
+          var dsp = c["dispatcher"];
+
+          cd.detectChanges();
+          expect(dsp.log).toEqual(['a=null']);
+          dsp.clear();
+
+          cd.detectChanges();
+          expect(dsp.log).toEqual([]);
+
+          context.a = [0];
+          cd.detectChanges();
+          expect(dsp.log).toEqual(["a=" +
+            arrayChangesAsString({
+              collection: ['0[null->0]'],
+              additions: ['0[null->0]']
+            })
+          ]);
+          dsp.clear();
+
+          context.a = null;
+          cd.detectChanges();
+          expect(dsp.log).toEqual(['a=null']);
+        });
+
+        it("should throw if not collection / null", () => {
+          var context = new TestData("not collection / null");
+          var c = createChangeDetector('a', 'a', context, null, true);
+          expect(() => c["changeDetector"].detectChanges())
+            .toThrowError("Collection records must be array like, map like or null");
+        });
+
+        describe("list", () => {
+          it("should support list changes", () => {
+            var context = new TestData([1, 2]);
+            expect(executeWatch("a", "a", context, null, true))
+              .toEqual(["a=" +
+                        arrayChangesAsString({
+                          collection: ['1[null->0]', '2[null->1]'],
+                          additions: ['1[null->0]', '2[null->1]']
+                       })]);
+          });
+
+          it("should handle reference changes", () => {
+            var context = new TestData([1, 2]);
+            var objs = createChangeDetector("a", "a", context, null, true);
+            var cd = objs["changeDetector"];
+            var dispatcher = objs["dispatcher"];
+            cd.detectChanges();
+            dispatcher.clear();
+
+            context.a = [2, 1];
+            cd.detectChanges();
+            expect(dispatcher.log).toEqual(["a=" +
+              arrayChangesAsString({
+                collection: ['2[1->0]', '1[0->1]'],
+                previous: ['1[0->1]', '2[1->0]'],
+                moves: ['2[1->0]', '1[0->1]']
+              })]);
+          });
+        });
+
+        describe("map", () => {
+          it("should support map changes", () => {
+            var map = MapWrapper.create();
+            MapWrapper.set(map, "foo", "bar");
+            var context = new TestData(map);
+            expect(executeWatch("a", "a", context, null, true))
+              .toEqual(["a=" +
+                        kvChangesAsString({
+                          map: ['foo[null->bar]'],
+                          additions: ['foo[null->bar]']
+                       })]);
+          });
+
+          it("should handle reference changes", () => {
+            var map = MapWrapper.create();
+            MapWrapper.set(map, "foo", "bar");
+            var context = new TestData(map);
+            var objs = createChangeDetector("a", "a", context, null, true);
+            var cd = objs["changeDetector"];
+            var dispatcher = objs["dispatcher"];
+            cd.detectChanges();
+            dispatcher.clear();
+
+            context.a = MapWrapper.create();
+            MapWrapper.set(context.a, "bar", "foo");
+            cd.detectChanges();
+            expect(dispatcher.log).toEqual(["a=" +
+              kvChangesAsString({
+                map: ['bar[null->foo]'],
+                previous: ['foo[bar->null]'],
+                additions: ['bar[null->foo]'],
+                removals: ['foo[bar->null]']
+              })]);
+          });
+        });
+
+        if (isJsObject({})) {
+          describe("js objects", () => {
+            it("should support object changes", () => {
+              var map = {"foo": "bar"};
+              var context = new TestData(map);
+              expect(executeWatch("a", "a", context, null, true))
+                .toEqual(["a=" +
+                          kvChangesAsString({
+                            map: ['foo[null->bar]'],
+                            additions: ['foo[null->bar]']
+                         })]);
+            });
+          });
+        }
+      });
     });
   });
 }

modules/change_detection/test/iterable.dart

@@ -0,0 +1,6 @@
+import 'dart:collection';
+
+class TestIterable extends IterableBase<int> {
+  List<int> list = [];
+  Iterator<int> get iterator => list.iterator;
+}

modules/change_detection/test/iterable.es6

@@ -0,0 +1,9 @@
+export class TestIterable {
+  constructor() {
+    this.list = [];
+  }
+
+  [Symbol.iterator]() {
+    return this.list[Symbol.iterator]();
+  }
+}

modules/change_detection/test/keyvalue_changes_spec.js

@@ -1,20 +1,18 @@
 import {describe, it, iit, xit, expect, beforeEach, afterEach} from 'test_lib/test_lib';
-
+import {KeyValueChanges} from 'change_detection/keyvalue_changes';
-import {MapChanges} from 'change_detection/map_changes';
+import {NumberWrapper, isJsObject} from 'facade/lang';
-
-import {isBlank, NumberWrapper} from 'facade/lang';
-
 import {MapWrapper} from 'facade/collection';
+import {kvChangesAsString} from './util';
 
 // todo(vicb): Update the code & tests for object equality
 export function main() {
-  describe('map_changes', function() {
+  describe('keyvalue_changes', function() {
-    describe('MapChanges', function() {
+    describe('KeyValueChanges', function() {
       var changes;
       var m;
 
       beforeEach(() => {
-        changes = new MapChanges();
+        changes = new KeyValueChanges();
         m = MapWrapper.create();
       });
 
@@ -27,14 +25,14 @@ export function main() {
 
         MapWrapper.set(m, 'a', 1);
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a[null->1]'],
           additions: ['a[null->1]']
         }));
 
         MapWrapper.set(m, 'b', 2);
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a', 'b[null->2]'],
           previous: ['a'],
           additions: ['b[null->2]']
@@ -49,7 +47,7 @@ export function main() {
         MapWrapper.set(m, 2, 10);
         MapWrapper.set(m, 1, 20);
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['1[10->20]', '2[20->10]'],
           previous: ['1[10->20]', '2[20->10]'],
           changes: ['1[10->20]', '2[20->10]']
@@ -61,14 +59,14 @@ export function main() {
 
         MapWrapper.set(m, 'a', 'A');
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a[null->A]'],
           additions: ['a[null->A]']
         }));
 
         MapWrapper.set(m, 'b', 'B');
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a', 'b[null->B]'],
           previous: ['a'],
           additions: ['b[null->B]']
@@ -77,7 +75,7 @@ export function main() {
         MapWrapper.set(m, 'b', 'BB');
         MapWrapper.set(m, 'd', 'D');
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a', 'b[B->BB]', 'd[null->D]'],
           previous: ['a', 'b[B->BB]'],
           additions: ['d[null->D]'],
@@ -86,7 +84,7 @@ export function main() {
 
         MapWrapper.delete(m, 'b');
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['a', 'd'],
           previous: ['a', 'b[BB->null]', 'd'],
           removals: ['b[BB->null]']
@@ -94,7 +92,7 @@ export function main() {
 
         MapWrapper.clear(m);
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           previous: ['a[A->null]', 'd[D->null]'],
           removals: ['a[A->null]', 'd[D->null]']
         }));
@@ -112,7 +110,7 @@ export function main() {
         MapWrapper.set(m, f + oo, b + ar);
         changes.check(m);
 
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['foo'],
           previous: ['foo']
         }));
@@ -123,25 +121,70 @@ export function main() {
         changes.check(m);
 
         changes.check(m);
-        expect(changes.toString()).toEqual(changesAsString({
+        expect(changes.toString()).toEqual(kvChangesAsString({
           map: ['foo'],
           previous: ['foo']
         }));
       });
+
+      // JS specific tests (JS Objects)
+      if (isJsObject({})) {
+        describe('JsObject changes', () => {
+          it('should support JS Object', () => {
+            expect(KeyValueChanges.supports({})).toBeTruthy();
+            expect(KeyValueChanges.supports("not supported")).toBeFalsy();
+            expect(KeyValueChanges.supports(0)).toBeFalsy();
+            expect(KeyValueChanges.supports(null)).toBeFalsy();
+          });
+
+          it('should do basic object watching', () => {
+            m = {};
+            changes.check(m);
+
+            m['a'] = 'A';
+            changes.check(m);
+            expect(changes.toString()).toEqual(kvChangesAsString({
+              map: ['a[null->A]'],
+              additions: ['a[null->A]']
+            }));
+
+            m['b'] = 'B';
+            changes.check(m);
+            expect(changes.toString()).toEqual(kvChangesAsString({
+              map: ['a', 'b[null->B]'],
+              previous: ['a'],
+              additions: ['b[null->B]']
+            }));
+
+            m['b'] = 'BB';
+            m['d'] = 'D';
+            changes.check(m);
+            expect(changes.toString()).toEqual(kvChangesAsString({
+              map: ['a', 'b[B->BB]', 'd[null->D]'],
+              previous: ['a', 'b[B->BB]'],
+              additions: ['d[null->D]'],
+              changes: ['b[B->BB]']
+            }));
+
+            m = {};
+            m['a'] = 'A';
+            m['d'] = 'D';
+            changes.check(m);
+            expect(changes.toString()).toEqual(kvChangesAsString({
+              map: ['a', 'd'],
+              previous: ['a', 'b[BB->null]', 'd'],
+              removals: ['b[BB->null]']
+            }));
+
+            m = {};
+            changes.check(m);
+            expect(changes.toString()).toEqual(kvChangesAsString({
+              previous: ['a[A->null]', 'd[D->null]'],
+              removals: ['a[A->null]', 'd[D->null]']
+            }));
+          });
+        });
+      }
     });
   });
 }
-
-function changesAsString({map, previous, additions, changes, removals}) {
-  if (isBlank(map)) map = [];
-  if (isBlank(previous)) previous = [];
-  if (isBlank(additions)) additions = [];
-  if (isBlank(changes)) changes = [];
-  if (isBlank(removals)) removals = [];
-
-  return "map: " + map.join(', ') + "\n" +
-         "previous: " + previous.join(', ') + "\n" +
-         "additions: " + additions.join(', ') + "\n" +
-         "changes: " + changes.join(', ') + "\n" +
-         "removals: " + removals.join(', ') + "\n";
-}

modules/change_detection/test/util.js

@@ -0,0 +1,29 @@
+import {isBlank} from 'facade/lang';
+
+export function arrayChangesAsString({collection, previous, additions, moves, removals}) {
+  if (isBlank(collection)) collection = [];
+  if (isBlank(previous)) previous = [];
+  if (isBlank(additions)) additions = [];
+  if (isBlank(moves)) moves = [];
+  if (isBlank(removals)) removals = [];
+
+  return "collection: " + collection.join(', ') + "\n" +
+         "previous: " + previous.join(', ') + "\n" +
+         "additions: " + additions.join(', ') + "\n" +
+         "moves: " + moves.join(', ') + "\n" +
+         "removals: " + removals.join(', ') + "\n";
+}
+
+export function kvChangesAsString({map, previous, additions, changes, removals}) {
+  if (isBlank(map)) map = [];
+  if (isBlank(previous)) previous = [];
+  if (isBlank(additions)) additions = [];
+  if (isBlank(changes)) changes = [];
+  if (isBlank(removals)) removals = [];
+
+  return "map: " + map.join(', ') + "\n" +
+         "previous: " + previous.join(', ') + "\n" +
+         "additions: " + additions.join(', ') + "\n" +
+         "changes: " + changes.join(', ') + "\n" +
+         "removals: " + removals.join(', ') + "\n";
+}

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
+// TODO: cannot export StringMap as a type as Dart does not support renaming types...
-// renaming types...
+/**
+ * Wraps Javascript Objects
+ */
 export class StringMapWrapper {
+  static create():Object {
     // Note: We are not using Object.create(null) here due to
     // performance!
-  static create():Object { return { }; }
+    // http://jsperf.com/ng2-object-create-null
+    return { };
+  }
   static get(map, key) {
     return map.hasOwnProperty(key) ? map[key] : undefined;
   }
@@ -45,9 +50,11 @@ export class StringMapWrapper {
   }
   static forEach(map, callback) {
     for (var prop in map) {
+      if (map.hasOwnProperty(prop)) {
         callback(map[prop], prop);
       }
     }
+  }
 }
 
 export class ListWrapper {
@@ -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");
+}