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

samples/swarm/swarm_ui_lib/touch/TouchHandler.dart

Index: samples/swarm/swarm_ui_lib/touch/TouchHandler.dart
diff --git a/samples/swarm/swarm_ui_lib/touch/TouchHandler.dart b/samples/swarm/swarm_ui_lib/touch/TouchHandler.dart
index 389aec7c05095327d6de9aedef65d71ec879b71b..c1ce2364dd2ec6c30b02946cfd8deeeea40bb2b8 100644
--- a/samples/swarm/swarm_ui_lib/touch/TouchHandler.dart
+++ b/samples/swarm/swarm_ui_lib/touch/TouchHandler.dart
@@ -233,7 +233,7 @@ class TouchHandler {
   void _onEnd(int timeStamp, [TouchEvent e = null]) {
     _touching = false;
     _touchable.onTouchEnd();
-    if (!_tracking || _draggable === null) {
+    if (!_tracking || _draggable == null) {
       return;
     }
     Touch touch = _getLastTouch();
@@ -246,7 +246,7 @@ class TouchHandler {
       _recentTouchesX = _removeOldTouches(_recentTouchesX, timeStamp);
       _recentTouchesY = _removeOldTouches(_recentTouchesY, timeStamp);
       _draggable.onDragEnd();
-      if (e !== null) {
+      if (e != null) {
         e.preventDefault();
       }
       ClickBuster.preventGhostClick(_startTouchX, _startTouchY);
@@ -258,7 +258,7 @@ class TouchHandler {
    * Touch move handler.
    */
   void _onMove(TouchEvent e) {
-    if (!_tracking || _draggable === null) {
+    if (!_tracking || _draggable == null) {
       return;
     }
     final touch = e.touches[0];
@@ -310,7 +310,7 @@ class TouchHandler {
       return;
     }
     _touching = true;
-    if (!_touchable.onTouchStart(e) || _draggable === null) {
+    if (!_touchable.onTouchStart(e) || _draggable == null) {
       return;
     }
     final touch = e.touches[0];
@@ -370,9 +370,7 @@ class TouchHandler {
   }
 
   // TODO(jacobr): why doesn't bool implement the xor operator directly?
-  static bool _xor(bool a, bool b) {
-    return (a === true || b === true) && !(a === true && b === true);
-  }
+  static bool _xor(bool a, bool b) => a != b;
 
   /**
    * Reset the touchable element.