perf(change_detection): do not check intermediate results

modules/angular2/src/change_detection/change_detection_jit_generator.ts

@@ -71,7 +71,6 @@ export class ChangeDetectorJITGenerator {
         return new ${this._typeName}(dispatcher, protos, directiveRecords);
       }
     `;
-
     return new Function('AbstractChangeDetector', 'ChangeDetectionUtil', 'protos',
                         'directiveRecords', classDefinition)(
         AbstractChangeDetector, ChangeDetectionUtil, this.records, this.directiveRecords);
@@ -171,7 +170,6 @@ export class ChangeDetectorJITGenerator {
 
     var oldValue = this._names.getFieldName(r.selfIndex);
     var newValue = this._names.getLocalName(r.selfIndex);
-    var change = this._names.getChangeName(r.selfIndex);
 
     var pipe = this._names.getPipeName(r.selfIndex);
     var cdRef = "this.ref";
@@ -179,7 +177,7 @@ export class ChangeDetectorJITGenerator {
     var protoIndex = r.selfIndex - 1;
     var pipeType = r.name;
 
-    return `
+    var read = `
       ${this._names.getCurrentProtoName()} = ${this._names.getProtosName()}[${protoIndex}];
       if (${pipe} === ${UTIL}.uninitialized) {
         ${pipe} = ${this._names.getPipesAccessorName()}.get('${pipeType}', ${context}, ${cdRef});
@@ -187,16 +185,20 @@ export class ChangeDetectorJITGenerator {
         ${pipe}.onDestroy();
         ${pipe} = ${this._names.getPipesAccessorName()}.get('${pipeType}', ${context}, ${cdRef});
       }
-
       ${newValue} = ${pipe}.transform(${context}, [${argString}]);
+    `;
+
+    var check = `
       if (${oldValue} !== ${newValue}) {
-        ${newValue} = ${UTIL}.unwrapValue(${newValue});
+        ${newValue} = ${UTIL}.unwrapValue(${newValue})
-        ${change} = true;
+        ${this._genChangeMarker(r)}
         ${this._genUpdateDirectiveOrElement(r)}
         ${this._genAddToChanges(r)}
         ${oldValue} = ${newValue};
       }
     `;
+
+    return r.shouldBeChecked() ? `${read}${check}` : read;
   }
 
   _genReferenceCheck(r: ProtoRecord): string {
@@ -204,22 +206,32 @@ export class ChangeDetectorJITGenerator {
     var newValue = this._names.getLocalName(r.selfIndex);
 
     var protoIndex = r.selfIndex - 1;
-    var check = `
+
+    var read = `
       ${this._names.getCurrentProtoName()} = ${this._names.getProtosName()}[${protoIndex}];
       ${this._genUpdateCurrentValue(r)}
+    `;
+
+    var check = `
       if (${newValue} !== ${oldValue}) {
-        ${this._names.getChangeName(r.selfIndex)} = true;
+        ${this._genChangeMarker(r)}
         ${this._genUpdateDirectiveOrElement(r)}
         ${this._genAddToChanges(r)}
         ${oldValue} = ${newValue};
       }
     `;
 
+    var genCode = r.shouldBeChecked() ? `${read}${check}` : read;
+
     if (r.isPureFunction()) {
       var condition = r.args.map((a) => this._names.getChangeName(a)).join(" || ");
-      return `if (${condition}) { ${check} } else { ${newValue} = ${oldValue}; }`;
+      if (r.isUsedByOtherRecord()) {
+        return `if (${condition}) { ${genCode} } else { ${newValue} = ${oldValue}; }`;
       } else {
-      return check;
+        return `if (${condition}) { ${genCode} }`;
+      }
+    } else {
+      return genCode;
     }
   }
 
@@ -267,6 +279,10 @@ export class ChangeDetectorJITGenerator {
         rhs = `${UTIL}.${r.name}(${argString})`;
         break;
 
+      case RecordType.COLLECTION_LITERAL:
+        rhs = `${UTIL}.${r.name}(${argString})`;
+        break;
+
       case RecordType.INTERPOLATE:
         rhs = this._genInterpolation(r);
         break;
@@ -293,6 +309,10 @@ export class ChangeDetectorJITGenerator {
     return res;
   }
 
+  _genChangeMarker(r: ProtoRecord): string {
+    return r.argumentToPureFunction ? `${this._names.getChangeName(r.selfIndex)} = true` : ``;
+  }
+
   _genUpdateDirectiveOrElement(r: ProtoRecord): string {
     if (!r.lastInBinding) return "";
 

modules/angular2/src/change_detection/coalesce.ts

@@ -12,7 +12,7 @@ import {RecordType, ProtoRecord} from './proto_record';
  * Records that are last in bindings CANNOT be removed, and instead are
  * replaced with very cheap SELF records.
  */
-export function coalesce(records: List<ProtoRecord>): List<ProtoRecord> {
+export function coalesce(records: ProtoRecord[]): ProtoRecord[] {
   var res: List<ProtoRecord> = [];
   var indexMap: Map<number, number> = new Map<number, number>();
 
@@ -24,8 +24,13 @@ export function coalesce(records: List<ProtoRecord>): List<ProtoRecord> {
     if (isPresent(matchingRecord) && record.lastInBinding) {
       res.push(_selfRecord(record, matchingRecord.selfIndex, res.length + 1));
       indexMap.set(r.selfIndex, matchingRecord.selfIndex);
+      matchingRecord.referencedBySelf = true;
 
     } else if (isPresent(matchingRecord) && !record.lastInBinding) {
+      if (record.argumentToPureFunction) {
+        matchingRecord.argumentToPureFunction = true;
+      }
+
       indexMap.set(r.selfIndex, matchingRecord.selfIndex);
 
     } else {
@@ -40,7 +45,7 @@ export function coalesce(records: List<ProtoRecord>): List<ProtoRecord> {
 function _selfRecord(r: ProtoRecord, contextIndex: number, selfIndex: number): ProtoRecord {
   return new ProtoRecord(RecordType.SELF, "self", null, [], r.fixedArgs, contextIndex,
                          r.directiveIndex, selfIndex, r.bindingRecord, r.expressionAsString,
-                         r.lastInBinding, r.lastInDirective);
+                         r.lastInBinding, r.lastInDirective, false, false);
 }
 
 function _findMatching(r: ProtoRecord, rs: List<ProtoRecord>) {
@@ -66,7 +71,8 @@ function _replaceIndices(r: ProtoRecord, selfIndex: number, indexMap: Map<any, a
   var contextIndex = _map(indexMap, r.contextIndex);
   return new ProtoRecord(r.mode, r.name, r.funcOrValue, args, r.fixedArgs, contextIndex,
                          r.directiveIndex, selfIndex, r.bindingRecord, r.expressionAsString,
-                         r.lastInBinding, r.lastInDirective);
+                         r.lastInBinding, r.lastInDirective, r.argumentToPureFunction,
+                         r.referencedBySelf);
 }
 
 function _map(indexMap: Map<any, any>, value: number) {

modules/angular2/src/change_detection/codegen_name_util.ts

@@ -83,9 +83,14 @@ export class CodegenNameUtil {
       if (i == CONTEXT_INDEX) {
         declarations.push(`${this.getLocalName(i)} = ${this.getFieldName(i)}`);
       } else {
+        var rec = this.records[i - 1];
+        if (rec.argumentToPureFunction) {
           var changeName = this.getChangeName(i);
           declarations.push(`${this.getLocalName(i)},${changeName}`);
           assignments.push(changeName);
+        } else {
+          declarations.push(`${this.getLocalName(i)}`);
+        }
       }
     }
     var assignmentsCode =
@@ -100,14 +105,18 @@ export class CodegenNameUtil {
   getAllFieldNames(): List<string> {
     var fieldList = [];
     for (var k = 0, kLen = this.getFieldCount(); k < kLen; ++k) {
+      if (k === 0 || this.records[k - 1].shouldBeChecked()) {
         fieldList.push(this.getFieldName(k));
       }
+    }
+
     for (var i = 0, iLen = this.records.length; i < iLen; ++i) {
       var rec = this.records[i];
       if (rec.isPipeRecord()) {
         fieldList.push(this.getPipeName(rec.selfIndex));
       }
     }
+
     for (var j = 0, jLen = this.directiveRecords.length; j < jLen; ++j) {
       var dRec = this.directiveRecords[j];
       fieldList.push(this.getDirectiveName(dRec.directiveIndex));

modules/angular2/src/change_detection/dynamic_change_detector.ts

@@ -150,9 +150,9 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
       return null;
     }
 
-    var prevValue = this._readSelf(proto);
     var currValue = this._calculateCurrValue(proto);
-
+    if (proto.shouldBeChecked()) {
+      var prevValue = this._readSelf(proto);
       if (!isSame(prevValue, currValue)) {
         if (proto.lastInBinding) {
           var change = ChangeDetectionUtil.simpleChange(prevValue, currValue);
@@ -160,9 +160,7 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
 
           this._writeSelf(proto, currValue);
           this._setChanged(proto, true);
-
           return change;
-
         } else {
           this._writeSelf(proto, currValue);
           this._setChanged(proto, true);
@@ -172,6 +170,12 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
         this._setChanged(proto, false);
         return null;
       }
+
+    } else {
+      this._writeSelf(proto, currValue);
+      this._setChanged(proto, true);
+      return null;
+    }
   }
 
   _calculateCurrValue(proto: ProtoRecord) {
@@ -215,6 +219,7 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
 
       case RecordType.INTERPOLATE:
       case RecordType.PRIMITIVE_OP:
+      case RecordType.COLLECTION_LITERAL:
         return FunctionWrapper.apply(proto.funcOrValue, this._readArgs(proto));
 
       default:
@@ -227,9 +232,10 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
     var args = this._readArgs(proto);
 
     var pipe = this._pipeFor(proto, context);
-    var prevValue = this._readSelf(proto);
     var currValue = pipe.transform(context, args);
 
+    if (proto.shouldBeChecked()) {
+      var prevValue = this._readSelf(proto);
       if (!isSame(prevValue, currValue)) {
         currValue = ChangeDetectionUtil.unwrapValue(currValue);
 
@@ -251,6 +257,11 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
         this._setChanged(proto, false);
         return null;
       }
+    } else {
+      this._writeSelf(proto, currValue);
+      this._setChanged(proto, true);
+      return null;
+    }
   }
 
   _pipeFor(proto: ProtoRecord, context) {
@@ -284,7 +295,9 @@ export class DynamicChangeDetector extends AbstractChangeDetector<any> {
 
   _writePipe(proto: ProtoRecord, value) { this.localPipes[proto.selfIndex] = value; }
 
-  _setChanged(proto: ProtoRecord, value: boolean) { this.changes[proto.selfIndex] = value; }
+  _setChanged(proto: ProtoRecord, value: boolean) {
+    if (proto.argumentToPureFunction) this.changes[proto.selfIndex] = value;
+  }
 
   _pureFuncAndArgsDidNotChange(proto: ProtoRecord): boolean {
     return proto.isPureFunction() && !this._argsChanged(proto);

modules/angular2/src/change_detection/proto_change_detector.ts

@@ -65,11 +65,23 @@ export class ProtoRecordBuilder {
     if (isPresent(oldLast) && oldLast.bindingRecord.directiveRecord == b.directiveRecord) {
       oldLast.lastInDirective = false;
     }
+    var numberOfRecordsBefore = this.records.length;
     this._appendRecords(b, variableNames);
     var newLast = ListWrapper.last(this.records);
     if (isPresent(newLast) && newLast !== oldLast) {
       newLast.lastInBinding = true;
       newLast.lastInDirective = true;
+      this._setArgumentToPureFunction(numberOfRecordsBefore);
+    }
+  }
+
+  _setArgumentToPureFunction(startIndex: number): void {
+    for (var i = startIndex; i < this.records.length; ++i) {
+      var rec = this.records[i];
+      if (rec.isPureFunction()) {
+        rec.args.forEach(recordIndex => this.records[recordIndex - 1].argumentToPureFunction =
+                             true);
+      }
     }
   }
 
@@ -77,7 +89,7 @@ export class ProtoRecordBuilder {
     if (b.isDirectiveLifecycle()) {
       this.records.push(new ProtoRecord(RecordType.DIRECTIVE_LIFECYCLE, b.lifecycleEvent, null, [],
                                         [], -1, null, this.records.length + 1, b, null, false,
-                                        false));
+                                        false, false, false));
     } else {
       _ConvertAstIntoProtoRecords.append(this.records, b, variableNames);
     }
@@ -145,12 +157,13 @@ class _ConvertAstIntoProtoRecords implements AstVisitor {
 
   visitLiteralArray(ast: LiteralArray): number {
     var primitiveName = `arrayFn${ast.expressions.length}`;
-    return this._addRecord(RecordType.PRIMITIVE_OP, primitiveName, _arrayFn(ast.expressions.length),
+    return this._addRecord(RecordType.COLLECTION_LITERAL, primitiveName,
-                           this._visitAll(ast.expressions), null, 0);
+                           _arrayFn(ast.expressions.length), this._visitAll(ast.expressions), null,
+                           0);
   }
 
   visitLiteralMap(ast: LiteralMap): number {
-    return this._addRecord(RecordType.PRIMITIVE_OP, _mapPrimitiveName(ast.keys),
+    return this._addRecord(RecordType.COLLECTION_LITERAL, _mapPrimitiveName(ast.keys),
                            ChangeDetectionUtil.mapFn(ast.keys), this._visitAll(ast.values), null,
                            0);
   }
@@ -208,11 +221,11 @@ class _ConvertAstIntoProtoRecords implements AstVisitor {
     if (context instanceof DirectiveIndex) {
       this._records.push(new ProtoRecord(type, name, funcOrValue, args, fixedArgs, -1, context,
                                          selfIndex, this._bindingRecord, this._expressionAsString,
-                                         false, false));
+                                         false, false, false, false));
     } else {
       this._records.push(new ProtoRecord(type, name, funcOrValue, args, fixedArgs, context, null,
                                          selfIndex, this._bindingRecord, this._expressionAsString,
-                                         false, false));
+                                         false, false, false, false));
     }
     return selfIndex;
   }

modules/angular2/src/change_detection/proto_record.ts

@@ -14,6 +14,7 @@ export enum RecordType {
   PIPE,
   INTERPOLATE,
   SAFE_PROPERTY,
+  COLLECTION_LITERAL,
   SAFE_INVOKE_METHOD,
   DIRECTIVE_LIFECYCLE
 }
@@ -23,10 +24,17 @@ export class ProtoRecord {
               public args: List<any>, public fixedArgs: List<any>, public contextIndex: number,
               public directiveIndex: DirectiveIndex, public selfIndex: number,
               public bindingRecord: BindingRecord, public expressionAsString: string,
-              public lastInBinding: boolean, public lastInDirective: boolean) {}
+              public lastInBinding: boolean, public lastInDirective: boolean,
+              public argumentToPureFunction: boolean, public referencedBySelf: boolean) {}
 
   isPureFunction(): boolean {
-    return this.mode === RecordType.INTERPOLATE || this.mode === RecordType.PRIMITIVE_OP;
+    return this.mode === RecordType.INTERPOLATE || this.mode === RecordType.COLLECTION_LITERAL;
+  }
+
+  isUsedByOtherRecord(): boolean { return !this.lastInBinding || this.referencedBySelf; }
+
+  shouldBeChecked(): boolean {
+    return this.argumentToPureFunction || this.lastInBinding || this.isPureFunction();
   }
 
   isPipeRecord(): boolean { return this.mode === RecordType.PIPE; }

modules/angular2/src/transform/template_compiler/change_detector_codegen.dart

@@ -246,14 +246,14 @@ class _CodegenState {
 
     var oldValue = _names.getFieldName(r.selfIndex);
     var newValue = _names.getLocalName(r.selfIndex);
-    var change = _names.getChangeName(r.selfIndex);
 
     var pipe = _names.getPipeName(r.selfIndex);
     var cdRef = 'this.ref';
 
     var protoIndex = r.selfIndex - 1;
     var pipeType = r.name;
-    return '''
+
+    var read = '''
       ${_names.getCurrentProtoName()} = ${_names.getProtosName()}[$protoIndex];
       if ($_IDENTICAL_CHECK_FN($pipe, $_UTIL.uninitialized)) {
         $pipe = ${_names.getPipesAccessorName()}.get('$pipeType', $context, $cdRef);
@@ -261,16 +261,20 @@ class _CodegenState {
         $pipe.onDestroy();
         $pipe = ${_names.getPipesAccessorName()}.get('$pipeType', $context, $cdRef);
       }
-
       $newValue = $pipe.transform($context, [$argString]);
+    ''';
+
+    var check = '''
       if ($_NOT_IDENTICAL_CHECK_FN($oldValue, $newValue)) {
         $newValue = $_UTIL.unwrapValue($newValue);
-        $change = true;
+        ${_genChangeMarker(r)}
         ${_genUpdateDirectiveOrElement(r)}
         ${_genAddToChanges(r)}
         $oldValue = $newValue;
       }
     ''';
+
+    return r.shouldBeChecked() ? "${read}${check}" : read;
   }
 
   String _genReferenceCheck(ProtoRecord r) {
@@ -278,22 +282,33 @@ class _CodegenState {
     var newValue = _names.getLocalName(r.selfIndex);
 
     var protoIndex = r.selfIndex - 1;
-    var check = '''
+
+    var read = '''
       ${_names.getCurrentProtoName()} = ${_names.getProtosName()}[$protoIndex];
       ${_genUpdateCurrentValue(r)}
+    ''';
+
+    var check = '''
       if ($_NOT_IDENTICAL_CHECK_FN($newValue, $oldValue)) {
-        ${_names.getChangeName(r.selfIndex)} = true;
+        ${_genChangeMarker(r)}
         ${_genUpdateDirectiveOrElement(r)}
         ${_genAddToChanges(r)}
         $oldValue = $newValue;
       }
     ''';
+
+    var genCode = r.shouldBeChecked() ? "${read}${check}" : read;
+
     if (r.isPureFunction()) {
       // Add an "if changed guard"
       var condition = r.args.map((a) => _names.getChangeName(a)).join(' || ');
-      return 'if ($condition) { $check } else { $newValue = $oldValue; }';
+      if (r.isUsedByOtherRecord()) {
+        return 'if ($condition) { $genCode } else { $newValue = $oldValue; }';
       } else  {
-      return check;
+        return 'if ($condition) { $genCode }';
+      }
+    } else {
+      return genCode;
     }
   }
 
@@ -344,6 +359,10 @@ class _CodegenState {
         rhs = '$_UTIL.${r.name}($argString)';
         break;
 
+      case RecordType.COLLECTION_LITERAL:
+        rhs = '$_UTIL.${r.name}($argString)';
+        break;
+
       case RecordType.INTERPOLATE:
         rhs = _genInterpolation(r);
         break;
@@ -370,6 +389,10 @@ class _CodegenState {
     return '$res';
   }
 
+  String _genChangeMarker(ProtoRecord r) {
+    return r.argumentToPureFunction ? "${this._names.getChangeName(r.selfIndex)} = true;" : "";
+  }
+
   String _genUpdateDirectiveOrElement(ProtoRecord r) {
     if (!r.lastInBinding) return '';
 

modules/angular2/test/change_detection/change_detector_config.ts

@@ -304,6 +304,7 @@ var _availableDefinitions = [
   '{z: 1}',
   '{z: a}',
   'name | pipe',
+  '(name | pipe).length',
   "name | pipe:'one':address.city",
   'value',
   'a',

modules/angular2/test/change_detection/change_detector_spec.ts

@@ -351,6 +351,14 @@ export function main() {
             val.changeDetector.detectChanges();
             expect(val.dispatcher.loggedValues).toEqual(['value one two default']);
           });
+
+          it('should support pipes as arguments to pure functions', () => {
+            var registry = new FakePipes('pipe', () => new IdentityPipe());
+            var person = new Person('bob');
+            var val = _createChangeDetector('(name | pipe).length', person, registry);
+            val.changeDetector.detectChanges();
+            expect(val.dispatcher.loggedValues).toEqual([3]);
+          });
         });
 
         it('should notify the dispatcher on all changes done', () => {

modules/angular2/test/change_detection/coalesce_spec.ts

@@ -7,14 +7,22 @@ import {DirectiveIndex} from 'angular2/src/change_detection/directive_record';
 
 export function main() {
   function r(funcOrValue, args, contextIndex, selfIndex,
-             {lastInBinding, mode, name, directiveIndex}:
+             {lastInBinding, mode, name, directiveIndex, argumentToPureFunction}: {
-                 {lastInBinding?: any, mode?: any, name?: any, directiveIndex?: any} = {}) {
+               lastInBinding?: any,
+               mode?: any,
+               name?: any,
+               directiveIndex?: any,
+               argumentToPureFunction?: boolean
+             } = {}) {
     if (isBlank(lastInBinding)) lastInBinding = false;
     if (isBlank(mode)) mode = RecordType.PROPERTY;
     if (isBlank(name)) name = "name";
     if (isBlank(directiveIndex)) directiveIndex = null;
+    if (isBlank(argumentToPureFunction)) argumentToPureFunction = false;
+
     return new ProtoRecord(mode, name, funcOrValue, args, null, contextIndex, directiveIndex,
-                           selfIndex, null, null, lastInBinding, false);
+                           selfIndex, null, null, lastInBinding, false, argumentToPureFunction,
+                           false);
   }
 
   describe("change detection - coalesce", () => {
@@ -56,7 +64,14 @@ export function main() {
           [r("user", [], 0, 1, {lastInBinding: true}), r("user", [], 0, 2, {lastInBinding: true})]);
 
       expect(rs[1]).toEqual(new ProtoRecord(RecordType.SELF, "self", null, [], null, 1, null, 2,
-                                            null, null, true, false));
+                                            null, null, true, false, false, false));
+    });
+
+    it("should set referencedBySelf", () => {
+      var rs = coalesce(
+          [r("user", [], 0, 1, {lastInBinding: true}), r("user", [], 0, 2, {lastInBinding: true})]);
+
+      expect(rs[0].referencedBySelf).toBeTruthy();
     });
 
     it("should not coalesce directive lifecycle records", () => {
@@ -88,5 +103,26 @@ export function main() {
          ]);
          expect(rs.length).toEqual(4);
        });
+
+    it('should preserve the argumentToPureFunction property', () => {
+      var rs = coalesce([
+        r("user", [], 0, 1),
+        r("user", [], 0, 2, {argumentToPureFunction: true}),
+        r("user", [], 0, 3),
+        r("name", [], 3, 4)
+      ]);
+      expect(rs)
+          .toEqual([r("user", [], 0, 1, {argumentToPureFunction: true}), r("name", [], 1, 2)]);
+    });
+
+    it('should preserve the argumentToPureFunction property (the original record)', () => {
+      var rs = coalesce([
+        r("user", [], 0, 1, {argumentToPureFunction: true}),
+        r("user", [], 0, 2),
+        r("name", [], 2, 3)
+      ]);
+      expect(rs)
+          .toEqual([r("user", [], 0, 1, {argumentToPureFunction: true}), r("name", [], 1, 2)]);
+    });
   });
 }

modules/angular2/test/change_detection/proto_record_builder_spec.ts

@@ -0,0 +1,38 @@
+import {
+  ddescribe,
+  describe,
+  it,
+  iit,
+  xit,
+  expect,
+  beforeEach,
+  afterEach,
+  inject
+} from 'angular2/test_lib';
+
+import {ProtoRecordBuilder} from 'angular2/src/change_detection/proto_change_detector';
+import {BindingRecord} from 'angular2/src/change_detection/binding_record';
+import {Parser} from 'angular2/src/change_detection/parser/parser';
+
+export function main() {
+  describe("ProtoRecordBuilder", () => {
+    it('should set argumentToPureFunction flag', inject([Parser], (p: Parser) => {
+         var builder = new ProtoRecordBuilder();
+         var ast = p.parseBinding("[1,2]", "location");  // collection literal is a pure function
+         builder.add(BindingRecord.createForElementProperty(ast, 0, "property"), []);
+
+         var isPureFunc = builder.records.map(r => r.argumentToPureFunction);
+         expect(isPureFunc).toEqual([true, true, false]);
+       }));
+
+    it('should not set argumentToPureFunction flag when not needed',
+       inject([Parser], (p: Parser) => {
+         var builder = new ProtoRecordBuilder();
+         var ast = p.parseBinding("f(1,2)", "location");
+         builder.add(BindingRecord.createForElementProperty(ast, 0, "property"), []);
+
+         var isPureFunc = builder.records.map(r => r.argumentToPureFunction);
+         expect(isPureFunc).toEqual([false, false, false]);
+       }));
+  });
+}

modules/angular2/test/change_detection/proto_record_spec.ts

@@ -0,0 +1,58 @@
+import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';
+import {isBlank} from 'angular2/src/facade/lang';
+
+import {RecordType, ProtoRecord} from 'angular2/src/change_detection/proto_record';
+
+export function main() {
+  function r({lastInBinding, mode, name, directiveIndex, argumentToPureFunction, referencedBySelf}:
+                 {
+                   lastInBinding?: any,
+                   mode?: any,
+                   name?: any,
+                   directiveIndex?: any,
+                   argumentToPureFunction?: boolean,
+                   referencedBySelf?: boolean
+                 } = {}) {
+    if (isBlank(lastInBinding)) lastInBinding = false;
+    if (isBlank(mode)) mode = RecordType.PROPERTY;
+    if (isBlank(name)) name = "name";
+    if (isBlank(directiveIndex)) directiveIndex = null;
+    if (isBlank(argumentToPureFunction)) argumentToPureFunction = false;
+    if (isBlank(referencedBySelf)) referencedBySelf = false;
+
+    return new ProtoRecord(mode, name, null, [], null, 0, directiveIndex, 0, null, null,
+                           lastInBinding, false, argumentToPureFunction, referencedBySelf);
+  }
+
+  describe("ProtoRecord", () => {
+    describe('shouldBeChecked', () => {
+      it('should be true for pure functions', () => {
+        expect(r({mode: RecordType.COLLECTION_LITERAL}).shouldBeChecked()).toBeTruthy();
+      });
+
+      it('should be true for args of pure functions', () => {
+        expect(r({mode: RecordType.CONST, argumentToPureFunction: true}).shouldBeChecked())
+            .toBeTruthy();
+      });
+
+      it('should be true for last in binding records', () => {
+        expect(r({mode: RecordType.CONST, lastInBinding: true}).shouldBeChecked()).toBeTruthy();
+      });
+
+      it('should be false otherwise',
+         () => { expect(r({mode: RecordType.CONST}).shouldBeChecked()).toBeFalsy(); });
+    });
+
+    describe('isUsedByOtherRecord', () => {
+      it('should be false for lastInBinding records',
+         () => { expect(r({lastInBinding: true}).isUsedByOtherRecord()).toBeFalsy(); });
+
+      it('should be true for lastInBinding records that are referenced by self records', () => {
+        expect(r({lastInBinding: true, referencedBySelf: true}).isUsedByOtherRecord()).toBeTruthy();
+      });
+
+      it('should be true for non lastInBinding records',
+         () => { expect(r({lastInBinding: false}).isUsedByOtherRecord()).toBeTruthy(); });
+    });
+  });
+}

modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart

@@ -38,9 +38,8 @@ class _MyComponent_ChangeDetector0
     var l_context = this.context,
         l_myNum0,
         c_myNum0,
-        l_interpolate1,
+        l_interpolate1;
-        c_interpolate1;
+    c_myNum0 = false;
-    c_myNum0 = c_interpolate1 = false;
     var isChanged = false;
     var changes = null;
 
@@ -56,7 +55,6 @@ class _MyComponent_ChangeDetector0
       l_interpolate1 =
           "Salad: " "${l_myNum0 == null ? "" : l_myNum0}" " is awesome";
       if (_gen.looseNotIdentical(l_interpolate1, this.interpolate1)) {
-        c_interpolate1 = true;
         if (throwOnChange) {
           _gen.ChangeDetectionUtil.throwOnChange(this.currentProto,
               _gen.ChangeDetectionUtil.simpleChange(
@@ -68,8 +66,6 @@ class _MyComponent_ChangeDetector0
 
         this.interpolate1 = l_interpolate1;
       }
-    } else {
-      l_interpolate1 = this.interpolate1;
     }
     changes = null;