a === b -> identical(a, b)

samples/swarm/swarm_ui_lib/touch/Scroller.dart

Index: samples/swarm/swarm_ui_lib/touch/Scroller.dart
diff --git a/samples/swarm/swarm_ui_lib/touch/Scroller.dart b/samples/swarm/swarm_ui_lib/touch/Scroller.dart
index df049a27dac8374e08107829c6999870ef0eb6e7..d3e41f615be8866294703b75a8096cb1fd8e9467 100644
--- a/samples/swarm/swarm_ui_lib/touch/Scroller.dart
+++ b/samples/swarm/swarm_ui_lib/touch/Scroller.dart
@@ -144,7 +144,7 @@ class Scroller implements Draggable, MomentumDelegate {
         _lookupContentSizeDelegate = lookupContentSizeDelegate,
         _element = scrollableElem,
         _frame = scrollableElem.parent,
-        _scrollTechnique = scrollTechnique !== null
+        _scrollTechnique = scrollTechnique != null
             ? scrollTechnique : ScrollerScrollTechnique.TRANSFORM_3D,
         _minPoint = new Coordinate(0, 0),
         _maxPoint = new Coordinate(0, 0),
@@ -240,35 +240,35 @@ class Scroller implements Draggable, MomentumDelegate {
   }
 
   EventListenerList get onScrollerStart {
-    if (_onScrollerStart === null) {
+    if (_onScrollerStart == null) {
       _onScrollerStart = new SimpleEventListenerList();
     }
     return _onScrollerStart;
   }
 
   EventListenerList get onScrollerEnd {
-    if (_onScrollerEnd === null) {
+    if (_onScrollerEnd == null) {
       _onScrollerEnd = new SimpleEventListenerList();
     }
     return _onScrollerEnd;
   }
 
   EventListenerList get onScrollerDragEnd {
-    if (_onScrollerDragEnd === null) {
+    if (_onScrollerDragEnd == null) {
       _onScrollerDragEnd = new SimpleEventListenerList();
     }
     return _onScrollerDragEnd;
   }
 
   EventListenerList get onContentMoved {
-    if (_onContentMoved === null) {
+    if (_onContentMoved == null) {
       _onContentMoved = new SimpleEventListenerList();
     }
     return _onContentMoved;
   }
 
   EventListenerList get onDecelStart {
-    if (_onDecelStart === null) {
+    if (_onDecelStart == null) {
       _onDecelStart = new SimpleEventListenerList();
     }
     return _onDecelStart;
@@ -280,7 +280,7 @@ class Scroller implements Draggable, MomentumDelegate {
    * notifications from this scroller.
    */
   void addScrollListener(ScrollListener listener) {
-    if (_scrollWatcher === null) {
+    if (_scrollWatcher == null) {
       _scrollWatcher = new ScrollWatcher(this);
       _scrollWatcher.initialize();
     }
@@ -310,7 +310,7 @@ class Scroller implements Draggable, MomentumDelegate {
    */
   Coordinate get currentTarget {
     Coordinate end = _momentum.destination;
-    if (end === null) {
+    if (end == null) {
       end = _contentOffset;
     }
     return end;
@@ -392,7 +392,7 @@ class Scroller implements Draggable, MomentumDelegate {
    * Returns the percent of the page scrolled horizontally.
    */
   num getHorizontalScrollPercent([num x = null]) {
-    x = x !== null ? x : _contentOffset.x;
+    x = x != null ? x : _contentOffset.x;
     return (x - _minPoint.x) / (_maxPoint.x - _minPoint.x);
   }
 
@@ -412,7 +412,7 @@ class Scroller implements Draggable, MomentumDelegate {
    * none is provided then the content's current y offset will be used.
    */
   num getVerticalScrollPercent([num y = null]) {
-    y = y !== null ? y : _contentOffset.y;
+    y = y != null ? y : _contentOffset.y;
     return (y - _minPoint.y) / Math.max(1, _maxPoint.y - _minPoint.y);
   }
 
@@ -542,7 +542,7 @@ class Scroller implements Draggable, MomentumDelegate {
    */
   void _resize(Callback callback) {
     window.requestLayoutFrame(() {
-      if (_lookupContentSizeDelegate !== null) {
+      if (_lookupContentSizeDelegate != null) {
         _contentSize = _lookupContentSizeDelegate();
       } else {
         _contentSize = new Size(_element.scrollWidth, _element.scrollHeight);