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

samples/swarm/swarm_ui_lib/view/MeasureText.dart

Index: samples/swarm/swarm_ui_lib/view/MeasureText.dart
diff --git a/samples/swarm/swarm_ui_lib/view/MeasureText.dart b/samples/swarm/swarm_ui_lib/view/MeasureText.dart
index 0f0618589f67b6a1ac9447ea906ae92eff0911fe..6002a413dd8c77ba6a855f89646c71df53092cd4 100644
--- a/samples/swarm/swarm_ui_lib/view/MeasureText.dart
+++ b/samples/swarm/swarm_ui_lib/view/MeasureText.dart
@@ -18,11 +18,11 @@ class MeasureText {
   static const String ELLIPSIS = '...';
 
   MeasureText(this.font) {
-    if (_context === null) {
+    if (_context == null) {
       CanvasElement canvas = new Element.tag('canvas');
       _context = canvas.getContext('2d');
     }
-    if (_spaceLength === null) {
+    if (_spaceLength == null) {
       _context.font = font;
       _spaceLength = _context.measureText(' ').width;
       _typicalCharLength = _context.measureText('k').width;
@@ -59,7 +59,7 @@ class MeasureText {
   /**
    * Add line broken text as html separated by <br> elements.
    * Returns the number of lines in the output.
-   * This function is safe to call with [:sb === null:] in which case just the
+   * This function is safe to call with [:sb == null:] in which case just the
    * line count is returned.
    */
   int addLineBrokenText(StringBuffer sb, String text, num lineWidth,
@@ -70,7 +70,7 @@ class MeasureText {
 
     // We can often avoid performing a full line break calculation when only
     // the number of lines and not the actual linebreaks is required.
-    if (sb === null) {
+    if (sb == null) {
       _context.font = font;
       int textWidth = _context.measureText(text).width.toInt();
       // By the pigeon hole principle, the resulting text will require at least
@@ -99,7 +99,7 @@ class MeasureText {
         // the first whitespace character encountered.
         end = Math.min(end + 50, text.length);
       }
-      if (sb !== null) {
+      if (sb != null) {
         if (lines > 1) {
           sb.add('<br>');
         }
@@ -136,7 +136,7 @@ class MeasureText {
           // Edge case:
           // It could be the very first word we ran into was too long for a
           // line in which case  we let it have its own line.
-          if (lastWordEndIndex !== null) {
+          if (lastWordEndIndex != null) {
             lines++;
             callback(startIndex, lastWordEndIndex, currentLength - wordLength);
           }
@@ -149,7 +149,7 @@ class MeasureText {
         lastWordEndIndex = i;
         currentLength += _spaceLength;
         wordStartIndex = null;
-      } else if (wordStartIndex === null && !whitespace) {
+      } else if (wordStartIndex == null && !whitespace) {
         wordStartIndex = i;
       }
       lastWhitespace = whitespace;