Use Object.create(…) instead of new …() for inheritance (faster)

10 files changed, 100 insertions, 100 deletions

diff --git a/blocks.js b/blocks.js
index 67324ca..3613dae 100644
--- a/blocks.js
+++ b/blocks.js
@@ -240,7 +240,7 @@ WorldMorph.prototype.customMorphs = function () {
 
 // SyntaxElementMorph inherits from Morph:
 
-SyntaxElementMorph.prototype = new Morph();
+SyntaxElementMorph.prototype = Object.create(Morph.prototype);
 SyntaxElementMorph.prototype.constructor = SyntaxElementMorph;
 SyntaxElementMorph.uber = Morph.prototype;
 
@@ -1937,7 +1937,7 @@ SyntaxElementMorph.prototype.endLayout = function () {
 
 // BlockMorph inherits from SyntaxElementMorph:
 
-BlockMorph.prototype = new SyntaxElementMorph();
+BlockMorph.prototype = Object.create(SyntaxElementMorph.prototype);
 BlockMorph.prototype.constructor = BlockMorph;
 BlockMorph.uber = SyntaxElementMorph.prototype;
 
@@ -3262,7 +3262,7 @@ BlockMorph.prototype.snap = function () {
 
 // CommandBlockMorph inherits from BlockMorph:
 
-CommandBlockMorph.prototype = new BlockMorph();
+CommandBlockMorph.prototype = Object.create(BlockMorph.prototype);
 CommandBlockMorph.prototype.constructor = CommandBlockMorph;
 CommandBlockMorph.uber = BlockMorph.prototype;
 
@@ -3942,7 +3942,7 @@ CommandBlockMorph.prototype.drawBottomRightEdge = function (context) {
 
 // HatBlockMorph inherits from CommandBlockMorph:
 
-HatBlockMorph.prototype = new CommandBlockMorph();
+HatBlockMorph.prototype = Object.create(CommandBlockMorph.prototype);
 HatBlockMorph.prototype.constructor = HatBlockMorph;
 HatBlockMorph.uber = CommandBlockMorph.prototype;
 
@@ -4120,7 +4120,7 @@ HatBlockMorph.prototype.drawTopLeftEdge = function (context) {
 
 // ReporterBlockMorph inherits from BlockMorph:
 
-ReporterBlockMorph.prototype = new BlockMorph();
+ReporterBlockMorph.prototype = Object.create(BlockMorph.prototype);
 ReporterBlockMorph.prototype.constructor = ReporterBlockMorph;
 ReporterBlockMorph.uber = BlockMorph.prototype;
 
@@ -4644,7 +4644,7 @@ ReporterBlockMorph.prototype.drawDiamond = function (context) {
 
 // RingMorph inherits from ReporterBlockMorph:
 
-RingMorph.prototype = new ReporterBlockMorph();
+RingMorph.prototype = Object.create(ReporterBlockMorph.prototype);
 RingMorph.prototype.constructor = RingMorph;
 RingMorph.uber = ReporterBlockMorph.prototype;
 
@@ -4781,7 +4781,7 @@ RingMorph.prototype.fixBlockColor = function (nearest, isForced) {
 
 // ScriptsMorph inherits from FrameMorph:
 
-ScriptsMorph.prototype = new FrameMorph();
+ScriptsMorph.prototype = Object.create(FrameMorph.prototype);
 ScriptsMorph.prototype.constructor = ScriptsMorph;
 ScriptsMorph.uber = FrameMorph.prototype;
 
@@ -5321,7 +5321,7 @@ ScriptsMorph.prototype.reactToDropOf = function (droppedMorph, hand) {
 
 // ArgMorph inherits from SyntaxElementMorph:
 
-ArgMorph.prototype = new SyntaxElementMorph();
+ArgMorph.prototype = Object.create(SyntaxElementMorph.prototype);
 ArgMorph.prototype.constructor = ArgMorph;
 ArgMorph.uber = SyntaxElementMorph.prototype;
 
@@ -5434,7 +5434,7 @@ ArgMorph.prototype.isEmptySlot = function () {
 
 // CommandSlotMorph inherits from ArgMorph:
 
-CommandSlotMorph.prototype = new ArgMorph();
+CommandSlotMorph.prototype = Object.create(ArgMorph.prototype);
 CommandSlotMorph.prototype.constructor = CommandSlotMorph;
 CommandSlotMorph.uber = ArgMorph.prototype;
 
@@ -5884,7 +5884,7 @@ CommandSlotMorph.prototype.drawEdges = function (context) {
 
 // RingCommandSlotMorph inherits from CommandSlotMorph:
 
-RingCommandSlotMorph.prototype = new CommandSlotMorph();
+RingCommandSlotMorph.prototype = Object.create(CommandSlotMorph.prototype);
 RingCommandSlotMorph.prototype.constructor = RingCommandSlotMorph;
 RingCommandSlotMorph.uber = CommandSlotMorph.prototype;
 
@@ -6040,7 +6040,7 @@ RingCommandSlotMorph.prototype.drawFlat = function (context) {
 
 // CSlotMorph inherits from CommandSlotMorph:
 
-CSlotMorph.prototype = new CommandSlotMorph();
+CSlotMorph.prototype = Object.create(CommandSlotMorph.prototype);
 CSlotMorph.prototype.constructor = CSlotMorph;
 CSlotMorph.uber = CommandSlotMorph.prototype;
 
@@ -6463,7 +6463,7 @@ CSlotMorph.prototype.drawBottomEdge = function (context) {
 
 // InputSlotMorph inherits from ArgMorph:
 
-InputSlotMorph.prototype = new ArgMorph();
+InputSlotMorph.prototype = Object.create(ArgMorph.prototype);
 InputSlotMorph.prototype.constructor = InputSlotMorph;
 InputSlotMorph.uber = ArgMorph.prototype;
 
@@ -7399,7 +7399,7 @@ InputSlotMorph.prototype.drawRoundBorder = function (context) {
 
 // TemplateSlotMorph inherits from ArgMorph:
 
-TemplateSlotMorph.prototype = new ArgMorph();
+TemplateSlotMorph.prototype = Object.create(ArgMorph.prototype);
 TemplateSlotMorph.prototype.constructor = TemplateSlotMorph;
 TemplateSlotMorph.uber = ArgMorph.prototype;
 
@@ -7503,7 +7503,7 @@ TemplateSlotMorph.prototype.drawRounded = ReporterBlockMorph
 
 // BooleanSlotMorph inherits from ArgMorph:
 
-BooleanSlotMorph.prototype = new ArgMorph();
+BooleanSlotMorph.prototype = Object.create(ArgMorph.prototype);
 BooleanSlotMorph.prototype.constructor = BooleanSlotMorph;
 BooleanSlotMorph.uber = ArgMorph.prototype;
 
@@ -7660,7 +7660,7 @@ BooleanSlotMorph.prototype.isEmptySlot = function () {
 
 // ArrowMorph inherits from Morph:
 
-ArrowMorph.prototype = new Morph();
+ArrowMorph.prototype = Object.create(Morph.prototype);
 ArrowMorph.prototype.constructor = ArrowMorph;
 ArrowMorph.uber = Morph.prototype;
 
@@ -7730,7 +7730,7 @@ ArrowMorph.prototype.drawNew = function () {
 
 // TextSlotMorph inherits from InputSlotMorph:
 
-TextSlotMorph.prototype = new InputSlotMorph();
+TextSlotMorph.prototype = Object.create(InputSlotMorph.prototype);
 TextSlotMorph.prototype.constructor = TextSlotMorph;
 TextSlotMorph.uber = InputSlotMorph.prototype;
 
@@ -7813,7 +7813,7 @@ TextSlotMorph.prototype.layoutChanged = function () {
 
 // SymbolMorph inherits from Morph:
 
-SymbolMorph.prototype = new Morph();
+SymbolMorph.prototype = Object.create(Morph.prototype);
 SymbolMorph.prototype.constructor = SymbolMorph;
 SymbolMorph.uber = Morph.prototype;
 
@@ -9106,7 +9106,7 @@ SymbolMorph.prototype.drawSymbolRobot = function (canvas, color) {
 
 // ColorSlotMorph  inherits from ArgMorph:
 
-ColorSlotMorph.prototype = new ArgMorph();
+ColorSlotMorph.prototype = Object.create(ArgMorph.prototype);
 ColorSlotMorph.prototype.constructor = ColorSlotMorph;
 ColorSlotMorph.uber = ArgMorph.prototype;
 
@@ -9214,7 +9214,7 @@ ColorSlotMorph.prototype.drawRectBorder =
 
 // BlockHighlightMorph inherits from Morph:
 
-BlockHighlightMorph.prototype = new Morph();
+BlockHighlightMorph.prototype = Object.create(Morph.prototype);
 BlockHighlightMorph.prototype.constructor = BlockHighlightMorph;
 BlockHighlightMorph.uber = Morph.prototype;
 
@@ -9239,7 +9239,7 @@ function BlockHighlightMorph() {
 
 // MultiArgMorph  inherits from ArgMorph:
 
-MultiArgMorph.prototype = new ArgMorph();
+MultiArgMorph.prototype = Object.create(ArgMorph.prototype);
 MultiArgMorph.prototype.constructor = MultiArgMorph;
 MultiArgMorph.uber = ArgMorph.prototype;
 
@@ -9669,7 +9669,7 @@ MultiArgMorph.prototype.isEmptySlot = function () {
 
 // ArgLabelMorph  inherits from ArgMorph:
 
-ArgLabelMorph.prototype = new ArgMorph();
+ArgLabelMorph.prototype = Object.create(ArgMorph.prototype);
 ArgLabelMorph.prototype.constructor = ArgLabelMorph;
 ArgLabelMorph.uber = ArgMorph.prototype;
 
@@ -9799,7 +9799,7 @@ ArgLabelMorph.prototype.isEmptySlot = function () {
 
 // FunctionSlotMorph inherits from ArgMorph:
 
-FunctionSlotMorph.prototype = new ArgMorph();
+FunctionSlotMorph.prototype = Object.create(ArgMorph.prototype);
 FunctionSlotMorph.prototype.constructor = FunctionSlotMorph;
 FunctionSlotMorph.uber = ArgMorph.prototype;
 
@@ -10180,7 +10180,7 @@ FunctionSlotMorph.prototype.drawDiamond = function (context) {
 
 // ReporterSlotMorph inherits from FunctionSlotMorph:
 
-ReporterSlotMorph.prototype = new FunctionSlotMorph();
+ReporterSlotMorph.prototype = Object.create(FunctionSlotMorph.prototype);
 ReporterSlotMorph.prototype.constructor = ReporterSlotMorph;
 ReporterSlotMorph.uber = FunctionSlotMorph.prototype;
 
@@ -10263,7 +10263,7 @@ ReporterSlotMorph.prototype.fixLayout = function () {
 
 // ReporterSlotMorph inherits from FunctionSlotMorph:
 
-RingReporterSlotMorph.prototype = new ReporterSlotMorph();
+RingReporterSlotMorph.prototype = Object.create(ReporterSlotMorph.prototype);
 RingReporterSlotMorph.prototype.constructor = RingReporterSlotMorph;
 RingReporterSlotMorph.uber = ReporterSlotMorph.prototype;
 
@@ -10651,7 +10651,7 @@ RingReporterSlotMorph.prototype.drawDiamond = function (context) {
 
 // CommentMorph inherits from BoxMorph:
 
-CommentMorph.prototype = new BoxMorph();
+CommentMorph.prototype = Object.create(BoxMorph.prototype);
 CommentMorph.prototype.constructor = CommentMorph;
 CommentMorph.uber = BoxMorph.prototype;
 
diff --git a/byob.js b/byob.js
index 1c2cfee..32d8969 100644
--- a/byob.js
+++ b/byob.js
@@ -379,7 +379,7 @@ CustomBlockDefinition.prototype.scriptsPicture = function () {
 
 // CustomCommandBlockMorph inherits from CommandBlockMorph:
 
-CustomCommandBlockMorph.prototype = new CommandBlockMorph();
+CustomCommandBlockMorph.prototype = Object.create(CommandBlockMorph.prototype);
 CustomCommandBlockMorph.prototype.constructor = CustomCommandBlockMorph;
 CustomCommandBlockMorph.uber = CommandBlockMorph.prototype;
 
@@ -896,7 +896,7 @@ CustomCommandBlockMorph.prototype.alternatives = function () {
 
 // CustomReporterBlockMorph inherits from ReporterBlockMorph:
 
-CustomReporterBlockMorph.prototype = new ReporterBlockMorph();
+CustomReporterBlockMorph.prototype = Object.create(ReporterBlockMorph.prototype);
 CustomReporterBlockMorph.prototype.constructor = CustomReporterBlockMorph;
 CustomReporterBlockMorph.uber = ReporterBlockMorph.prototype;
 
@@ -1028,7 +1028,7 @@ CustomReporterBlockMorph.prototype.alternatives
 
 // JaggedBlockMorph inherits from ReporterBlockMorph:
 
-JaggedBlockMorph.prototype = new ReporterBlockMorph();
+JaggedBlockMorph.prototype = Object.create(ReporterBlockMorph.prototype);
 JaggedBlockMorph.prototype.constructor = JaggedBlockMorph;
 JaggedBlockMorph.uber = ReporterBlockMorph.prototype;
 
@@ -1177,7 +1177,7 @@ JaggedBlockMorph.prototype.drawEdges = function (context) {
 
 // BlockDialogMorph inherits from DialogBoxMorph:
 
-BlockDialogMorph.prototype = new DialogBoxMorph();
+BlockDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 BlockDialogMorph.prototype.constructor = BlockDialogMorph;
 BlockDialogMorph.uber = DialogBoxMorph.prototype;
 
@@ -1624,7 +1624,7 @@ BlockDialogMorph.prototype.fixLayout = function () {
 
 // BlockEditorMorph inherits from DialogBoxMorph:
 
-BlockEditorMorph.prototype = new DialogBoxMorph();
+BlockEditorMorph.prototype = Object.create(DialogBoxMorph.prototype);
 BlockEditorMorph.prototype.constructor = BlockEditorMorph;
 BlockEditorMorph.uber = DialogBoxMorph.prototype;
 
@@ -1936,7 +1936,7 @@ BlockEditorMorph.prototype.fixLayout = function () {
 
 // PrototypeHatBlockMorph inherits from HatBlockMorph:
 
-PrototypeHatBlockMorph.prototype = new HatBlockMorph();
+PrototypeHatBlockMorph.prototype = Object.create(HatBlockMorph.prototype);
 PrototypeHatBlockMorph.prototype.constructor = PrototypeHatBlockMorph;
 PrototypeHatBlockMorph.uber = HatBlockMorph.prototype;
 
@@ -2146,7 +2146,7 @@ BlockLabelFragment.prototype.setSingleInputType = function (type) {
 
 // BlockLabelFragmentMorph inherits from StringMorph:
 
-BlockLabelFragmentMorph.prototype = new StringMorph();
+BlockLabelFragmentMorph.prototype = Object.create(StringMorph.prototype);
 BlockLabelFragmentMorph.prototype.constructor = BlockLabelFragmentMorph;
 BlockLabelFragmentMorph.uber = StringMorph.prototype;
 
@@ -2268,7 +2268,7 @@ BlockLabelFragmentMorph.prototype.userMenu = function () {
 
 // BlockLabelPlaceHolderMorph inherits from StringMorph:
 
-BlockLabelPlaceHolderMorph.prototype = new StringMorph();
+BlockLabelPlaceHolderMorph.prototype = Object.create(StringMorph.prototype);
 BlockLabelPlaceHolderMorph.prototype.constructor = BlockLabelPlaceHolderMorph;
 BlockLabelPlaceHolderMorph.uber = StringMorph.prototype;
 
@@ -2396,7 +2396,7 @@ BlockLabelPlaceHolderMorph.prototype.updateBlockLabel
 
 // BlockInputFragmentMorph inherits from TemplateSlotMorph:
 
-BlockInputFragmentMorph.prototype = new TemplateSlotMorph();
+BlockInputFragmentMorph.prototype = Object.create(TemplateSlotMorph.prototype);
 BlockInputFragmentMorph.prototype.constructor = BlockInputFragmentMorph;
 BlockInputFragmentMorph.uber = TemplateSlotMorph.prototype;
 
@@ -2426,7 +2426,7 @@ BlockInputFragmentMorph.prototype.updateBlockLabel
 
 // InputSlotDialogMorph inherits from DialogBoxMorph:
 
-InputSlotDialogMorph.prototype = new DialogBoxMorph();
+InputSlotDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 InputSlotDialogMorph.prototype.constructor = InputSlotDialogMorph;
 InputSlotDialogMorph.uber = DialogBoxMorph.prototype;
 
@@ -3026,7 +3026,7 @@ InputSlotDialogMorph.prototype.show = function () {
 
 // VariableDialogMorph inherits from DialogBoxMorph:
 
-VariableDialogMorph.prototype = new DialogBoxMorph();
+VariableDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 VariableDialogMorph.prototype.constructor = VariableDialogMorph;
 VariableDialogMorph.uber = DialogBoxMorph.prototype;
 
@@ -3145,7 +3145,7 @@ VariableDialogMorph.prototype.fixLayout = function () {
 
 // BlockExportDialogMorph inherits from DialogBoxMorph:
 
-BlockExportDialogMorph.prototype = new DialogBoxMorph();
+BlockExportDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 BlockExportDialogMorph.prototype.constructor = BlockExportDialogMorph;
 BlockExportDialogMorph.uber = DialogBoxMorph.prototype;
 
@@ -3327,7 +3327,7 @@ BlockExportDialogMorph.prototype.fixLayout
 // BlockImportDialogMorph inherits from DialogBoxMorph
 // and pseudo-inherits from BlockExportDialogMorph:
 
-BlockImportDialogMorph.prototype = new DialogBoxMorph();
+BlockImportDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 BlockImportDialogMorph.prototype.constructor = BlockImportDialogMorph;
 BlockImportDialogMorph.uber = DialogBoxMorph.prototype;
 
diff --git a/gui.js b/gui.js
index 026a12c..89e2d89 100644
--- a/gui.js
+++ b/gui.js
@@ -88,7 +88,7 @@ var JukeboxMorph;
 
 // IDE_Morph inherits from Morph:
 
-IDE_Morph.prototype = new Morph();
+IDE_Morph.prototype = Object.create(Morph.prototype);
 IDE_Morph.prototype.constructor = IDE_Morph;
 IDE_Morph.uber = Morph.prototype;
 
@@ -4274,7 +4274,7 @@ IDE_Morph.prototype.prompt = function (message, callback, choices, key) {
 
 // ProjectDialogMorph inherits from DialogBoxMorph:
 
-ProjectDialogMorph.prototype = new DialogBoxMorph();
+ProjectDialogMorph.prototype = Object.create(DialogBoxMorph.prototype);
 ProjectDialogMorph.prototype.constructor = ProjectDialogMorph;
 ProjectDialogMorph.uber = DialogBoxMorph.prototype;
 
@@ -5181,7 +5181,7 @@ ProjectDialogMorph.prototype.fixLayout = function () {
 
 // SpriteIconMorph inherits from ToggleButtonMorph (Widgets)
 
-SpriteIconMorph.prototype = new ToggleButtonMorph();
+SpriteIconMorph.prototype = Object.create(ToggleButtonMorph.prototype);
 SpriteIconMorph.prototype.constructor = SpriteIconMorph;
 SpriteIconMorph.uber = ToggleButtonMorph.prototype;
 
@@ -5571,7 +5571,7 @@ SpriteIconMorph.prototype.copySound = function (sound) {
 // CostumeIconMorph inherits from ToggleButtonMorph (Widgets)
 // ... and copies methods from SpriteIconMorph
 
-CostumeIconMorph.prototype = new ToggleButtonMorph();
+CostumeIconMorph.prototype = Object.create(ToggleButtonMorph.prototype);
 CostumeIconMorph.prototype.constructor = CostumeIconMorph;
 CostumeIconMorph.uber = ToggleButtonMorph.prototype;
 
@@ -5782,7 +5782,7 @@ CostumeIconMorph.prototype.prepareToBeGrabbed = function () {
 // TurtleIconMorph inherits from ToggleButtonMorph (Widgets)
 // ... and copies methods from SpriteIconMorph
 
-TurtleIconMorph.prototype = new ToggleButtonMorph();
+TurtleIconMorph.prototype = Object.create(ToggleButtonMorph.prototype);
 TurtleIconMorph.prototype.constructor = TurtleIconMorph;
 TurtleIconMorph.uber = ToggleButtonMorph.prototype;
 
@@ -5965,7 +5965,7 @@ TurtleIconMorph.prototype.userMenu = function () {
 
 // WardrobeMorph inherits from ScrollFrameMorph
 
-WardrobeMorph.prototype = new ScrollFrameMorph();
+WardrobeMorph.prototype = Object.create(ScrollFrameMorph.prototype);
 WardrobeMorph.prototype.constructor = WardrobeMorph;
 WardrobeMorph.uber = ScrollFrameMorph.prototype;
 
@@ -6148,7 +6148,7 @@ WardrobeMorph.prototype.reactToDropOf = function (icon) {
 // SoundIconMorph inherits from ToggleButtonMorph (Widgets)
 // ... and copies methods from SpriteIconMorph
 
-SoundIconMorph.prototype = new ToggleButtonMorph();
+SoundIconMorph.prototype = Object.create(ToggleButtonMorph.prototype);
 SoundIconMorph.prototype.constructor = SoundIconMorph;
 SoundIconMorph.uber = ToggleButtonMorph.prototype;
 
@@ -6356,7 +6356,7 @@ SoundIconMorph.prototype.prepareToBeGrabbed = function () {
 
 // JukeboxMorph instance creation
 
-JukeboxMorph.prototype = new ScrollFrameMorph();
+JukeboxMorph.prototype = Object.create(ScrollFrameMorph.prototype);
 JukeboxMorph.prototype.constructor = JukeboxMorph;
 JukeboxMorph.uber = ScrollFrameMorph.prototype;
 
diff --git a/lists.js b/lists.js
index bd856fe..be7f933 100644
--- a/lists.js
+++ b/lists.js
@@ -363,7 +363,7 @@ List.prototype.equalTo = function (other) {
 
 // ListWatcherMorph inherits from BoxMorph:
 
-ListWatcherMorph.prototype = new BoxMorph();
+ListWatcherMorph.prototype = Object.create(BoxMorph.prototype);
 ListWatcherMorph.prototype.constructor = ListWatcherMorph;
 ListWatcherMorph.uber = BoxMorph.prototype;
 
diff --git a/morphic.js b/morphic.js
index 2850e32..029afd1 100644
--- a/morphic.js
+++ b/morphic.js
@@ -528,7 +528,7 @@
     whose "isTemplate" flag is false, in other words: a non-template.
 
     When creating a copy from a template, the copy's
-    
+
         reactToTemplateCopy
 
     is invoked, if it is present.
@@ -2171,7 +2171,7 @@ var TextMorph;
 
 // Morph inherits from Node:
 
-Morph.prototype = new Node();
+Morph.prototype = Object.create(Node.prototype);
 Morph.prototype.constructor = Morph;
 Morph.uber = Node.prototype;
 
@@ -3696,7 +3696,7 @@ Morph.prototype.overlappingImage = function (otherMorph) {
 
 // ShadowMorph inherits from Morph:
 
-ShadowMorph.prototype = new Morph();
+ShadowMorph.prototype = Object.create(Morph.prototype);
 ShadowMorph.prototype.constructor = ShadowMorph;
 ShadowMorph.uber = Morph.prototype;
 
@@ -3712,7 +3712,7 @@ function ShadowMorph() {
 
 // HandleMorph inherits from Morph:
 
-HandleMorph.prototype = new Morph();
+HandleMorph.prototype = Object.create(Morph.prototype);
 HandleMorph.prototype.constructor = HandleMorph;
 HandleMorph.uber = Morph.prototype;
 
@@ -3967,7 +3967,7 @@ var PenMorph;
 
 // PenMorph inherits from Morph:
 
-PenMorph.prototype = new Morph();
+PenMorph.prototype = Object.create(Morph.prototype);
 PenMorph.prototype.constructor = PenMorph;
 PenMorph.uber = Morph.prototype;
 
@@ -4199,7 +4199,7 @@ var ColorPaletteMorph;
 
 // ColorPaletteMorph inherits from Morph:
 
-ColorPaletteMorph.prototype = new Morph();
+ColorPaletteMorph.prototype = Object.create(Morph.prototype);
 ColorPaletteMorph.prototype.constructor = ColorPaletteMorph;
 ColorPaletteMorph.uber = Morph.prototype;
 
@@ -4331,7 +4331,7 @@ var GrayPaletteMorph;
 
 // GrayPaletteMorph inherits from ColorPaletteMorph:
 
-GrayPaletteMorph.prototype = new ColorPaletteMorph();
+GrayPaletteMorph.prototype = Object.create(ColorPaletteMorph.prototype);
 GrayPaletteMorph.prototype.constructor = GrayPaletteMorph;
 GrayPaletteMorph.uber = ColorPaletteMorph.prototype;
 
@@ -4362,7 +4362,7 @@ GrayPaletteMorph.prototype.drawNew = function () {
 
 // ColorPickerMorph inherits from Morph:
 
-ColorPickerMorph.prototype = new Morph();
+ColorPickerMorph.prototype = Object.create(Morph.prototype);
 ColorPickerMorph.prototype.constructor = ColorPickerMorph;
 ColorPickerMorph.uber = Morph.prototype;
 
@@ -4431,7 +4431,7 @@ var BlinkerMorph;
 
 // BlinkerMorph inherits from Morph:
 
-BlinkerMorph.prototype = new Morph();
+BlinkerMorph.prototype = Object.create(Morph.prototype);
 BlinkerMorph.prototype.constructor = BlinkerMorph;
 BlinkerMorph.uber = Morph.prototype;
 
@@ -4464,7 +4464,7 @@ var CursorMorph;
 
 // CursorMorph inherits from BlinkerMorph:
 
-CursorMorph.prototype = new BlinkerMorph();
+CursorMorph.prototype = Object.create(BlinkerMorph.prototype);
 CursorMorph.prototype.constructor = CursorMorph;
 CursorMorph.uber = BlinkerMorph.prototype;
 
@@ -4884,7 +4884,7 @@ var BoxMorph;
 
 // BoxMorph inherits from Morph:
 
-BoxMorph.prototype = new Morph();
+BoxMorph.prototype = Object.create(Morph.prototype);
 BoxMorph.prototype.constructor = BoxMorph;
 BoxMorph.uber = Morph.prototype;
 
@@ -5092,7 +5092,7 @@ var SpeechBubbleMorph;
 
 // SpeechBubbleMorph inherits from BoxMorph:
 
-SpeechBubbleMorph.prototype = new BoxMorph();
+SpeechBubbleMorph.prototype = Object.create(BoxMorph.prototype);
 SpeechBubbleMorph.prototype.constructor = SpeechBubbleMorph;
 SpeechBubbleMorph.uber = BoxMorph.prototype;
 
@@ -5392,7 +5392,7 @@ var CircleBoxMorph;
 
 // CircleBoxMorph inherits from Morph:
 
-CircleBoxMorph.prototype = new Morph();
+CircleBoxMorph.prototype = Object.create(Morph.prototype);
 CircleBoxMorph.prototype.constructor = CircleBoxMorph;
 CircleBoxMorph.uber = Morph.prototype;
 
@@ -5512,7 +5512,7 @@ var SliderButtonMorph;
 
 // SliderButtonMorph inherits from CircleBoxMorph:
 
-SliderButtonMorph.prototype = new CircleBoxMorph();
+SliderButtonMorph.prototype = Object.create(CircleBoxMorph.prototype);
 SliderButtonMorph.prototype.constructor = SliderButtonMorph;
 SliderButtonMorph.uber = CircleBoxMorph.prototype;
 
@@ -5724,7 +5724,7 @@ SliderButtonMorph.prototype.mouseMove = function () {
 
 // SliderMorph inherits from CircleBoxMorph:
 
-SliderMorph.prototype = new CircleBoxMorph();
+SliderMorph.prototype = Object.create(CircleBoxMorph.prototype);
 SliderMorph.prototype.constructor = SliderMorph;
 SliderMorph.uber = CircleBoxMorph.prototype;
 
@@ -6092,7 +6092,7 @@ var MouseSensorMorph;
 
 // MouseSensorMorph inherits from BoxMorph:
 
-MouseSensorMorph.prototype = new BoxMorph();
+MouseSensorMorph.prototype = Object.create(BoxMorph.prototype);
 MouseSensorMorph.prototype.constructor = MouseSensorMorph;
 MouseSensorMorph.uber = BoxMorph.prototype;
 
@@ -6166,7 +6166,7 @@ var TriggerMorph;
 
 // InspectorMorph inherits from BoxMorph:
 
-InspectorMorph.prototype = new BoxMorph();
+InspectorMorph.prototype = Object.create(BoxMorph.prototype);
 InspectorMorph.prototype.constructor = InspectorMorph;
 InspectorMorph.uber = BoxMorph.prototype;
 
@@ -6661,7 +6661,7 @@ var MenuItemMorph;
 
 // MenuMorph inherits from BoxMorph:
 
-MenuMorph.prototype = new BoxMorph();
+MenuMorph.prototype = Object.create(BoxMorph.prototype);
 MenuMorph.prototype.constructor = MenuMorph;
 MenuMorph.uber = BoxMorph.prototype;
 
@@ -6956,7 +6956,7 @@ MenuMorph.prototype.popUpCenteredInWorld = function (world) {
 
 // StringMorph inherits from Morph:
 
-StringMorph.prototype = new Morph();
+StringMorph.prototype = Object.create(Morph.prototype);
 StringMorph.prototype.constructor = StringMorph;
 StringMorph.uber = Morph.prototype;
 
@@ -7491,7 +7491,7 @@ StringMorph.prototype.disableSelecting = function () {
 
 // TextMorph inherits from Morph:
 
-TextMorph.prototype = new Morph();
+TextMorph.prototype = Object.create(Morph.prototype);
 TextMorph.prototype.constructor = TextMorph;
 TextMorph.uber = Morph.prototype;
 
@@ -8016,7 +8016,7 @@ TextMorph.prototype.inspectIt = function () {
 
 // TriggerMorph inherits from Morph:
 
-TriggerMorph.prototype = new Morph();
+TriggerMorph.prototype = Object.create(Morph.prototype);
 TriggerMorph.prototype.constructor = TriggerMorph;
 TriggerMorph.uber = Morph.prototype;
 
@@ -8285,7 +8285,7 @@ var MenuItemMorph;
 
 // MenuItemMorph inherits from TriggerMorph:
 
-MenuItemMorph.prototype = new TriggerMorph();
+MenuItemMorph.prototype = Object.create(TriggerMorph.prototype);
 MenuItemMorph.prototype.constructor = MenuItemMorph;
 MenuItemMorph.uber = TriggerMorph.prototype;
 
@@ -8444,7 +8444,7 @@ MenuItemMorph.prototype.isSelectedListItem = function () {
 
 // Frames inherit from Morph:
 
-FrameMorph.prototype = new Morph();
+FrameMorph.prototype = Object.create(Morph.prototype);
 FrameMorph.prototype.constructor = FrameMorph;
 FrameMorph.uber = Morph.prototype;
 
@@ -8638,7 +8638,7 @@ FrameMorph.prototype.keepAllSubmorphsWithin = function () {
 
 // ScrollFrameMorph ////////////////////////////////////////////////////
 
-ScrollFrameMorph.prototype = new FrameMorph();
+ScrollFrameMorph.prototype = Object.create(FrameMorph.prototype);
 ScrollFrameMorph.prototype.constructor = ScrollFrameMorph;
 ScrollFrameMorph.uber = FrameMorph.prototype;
 
@@ -9013,7 +9013,7 @@ ScrollFrameMorph.prototype.toggleTextLineWrapping = function () {
 
 // ListMorph ///////////////////////////////////////////////////////////
 
-ListMorph.prototype = new ScrollFrameMorph();
+ListMorph.prototype = Object.create(ScrollFrameMorph.prototype);
 ListMorph.prototype.constructor = ListMorph;
 ListMorph.uber = ScrollFrameMorph.prototype;
 
@@ -9151,7 +9151,7 @@ ListMorph.prototype.setExtent = function (aPoint) {
 
 // StringFieldMorph inherit from FrameMorph:
 
-StringFieldMorph.prototype = new FrameMorph();
+StringFieldMorph.prototype = Object.create(FrameMorph.prototype);
 StringFieldMorph.prototype.constructor = StringFieldMorph;
 StringFieldMorph.uber = FrameMorph.prototype;
 
@@ -9265,7 +9265,7 @@ var BouncerMorph;
 
 // Bouncers inherit from Morph:
 
-BouncerMorph.prototype = new Morph();
+BouncerMorph.prototype = Object.create(Morph.prototype);
 BouncerMorph.prototype.constructor = BouncerMorph;
 BouncerMorph.uber = Morph.prototype;
 
@@ -9352,7 +9352,7 @@ BouncerMorph.prototype.step = function () {
 
 // HandMorph inherits from Morph:
 
-HandMorph.prototype = new Morph();
+HandMorph.prototype = Object.create(Morph.prototype);
 HandMorph.prototype.constructor = HandMorph;
 HandMorph.uber = Morph.prototype;
 
@@ -9987,7 +9987,7 @@ HandMorph.prototype.moveBy = function (delta) {
 
 // WorldMorph inherits from FrameMorph:
 
-WorldMorph.prototype = new FrameMorph();
+WorldMorph.prototype = Object.create(FrameMorph.prototype);
 WorldMorph.prototype.constructor = WorldMorph;
 WorldMorph.uber = FrameMorph.prototype;
 
diff --git a/objects.js b/objects.js
index 8cae1c7..462aed2 100644
--- a/objects.js
+++ b/objects.js
@@ -147,7 +147,7 @@ var SpriteHighlightMorph;
 
 // SpriteMorph inherits from PenMorph:
 
-SpriteMorph.prototype = new PenMorph();
+SpriteMorph.prototype = Object.create(PenMorph.prototype);
 SpriteMorph.prototype.constructor = SpriteMorph;
 SpriteMorph.uber = PenMorph.prototype;
 
@@ -583,7 +583,7 @@ SpriteMorph.prototype.initBlocks = function () {
         },
 
     /* migrated to a newer block version:
-  
+
         receiveClick: {
             type: 'hat',
             category: 'control',
@@ -3008,7 +3008,7 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
         var i;
         if (value !== 0) {
             for (i = 0; i < p.length; i += 4) {
-                p[i] += value; //255 = 100% of this color 
+                p[i] += value; //255 = 100% of this color
                 p[i + 1] += value;
                 p[i + 2] += value;
             }
@@ -4289,7 +4289,7 @@ SpriteMorph.prototype.doScreenshot = function (imgSource, data) {
 
 // SpriteHighlightMorph inherits from Morph:
 
-SpriteHighlightMorph.prototype = new Morph();
+SpriteHighlightMorph.prototype = Object.create(Morph.prototype);
 SpriteHighlightMorph.prototype.constructor = SpriteHighlightMorph;
 SpriteHighlightMorph.uber = Morph.prototype;
 
@@ -4307,7 +4307,7 @@ function SpriteHighlightMorph() {
 
 // StageMorph inherits from FrameMorph:
 
-StageMorph.prototype = new FrameMorph();
+StageMorph.prototype = Object.create(FrameMorph.prototype);
 StageMorph.prototype.constructor = StageMorph;
 StageMorph.uber = FrameMorph.prototype;
 
@@ -5669,7 +5669,7 @@ StageMorph.prototype.replaceDoubleDefinitionsFor
 
 // SpriteBubbleMorph inherits from SpeechBubbleMorph:
 
-SpriteBubbleMorph.prototype = new SpeechBubbleMorph();
+SpriteBubbleMorph.prototype = Object.create(SpeechBubbleMorph.prototype);
 SpriteBubbleMorph.prototype.constructor = SpriteBubbleMorph;
 SpriteBubbleMorph.uber = SpeechBubbleMorph.prototype;
 
@@ -6168,7 +6168,7 @@ Costume.prototype.isTainted = function () {
 
 // SVG_Costume inherits from Costume:
 
-SVG_Costume.prototype = new Costume();
+SVG_Costume.prototype = Object.create(Costume.prototype);
 SVG_Costume.prototype.constructor = SVG_Costume;
 SVG_Costume.uber = Costume.prototype;
 
@@ -6219,7 +6219,7 @@ SVG_Costume.prototype.shrinkToFit = function (extentPoint) {
 
 // CostumeEditorMorph inherits from Morph:
 
-CostumeEditorMorph.prototype = new Morph();
+CostumeEditorMorph.prototype = Object.create(Morph.prototype);
 CostumeEditorMorph.prototype.constructor = CostumeEditorMorph;
 CostumeEditorMorph.uber = Morph.prototype;
 
@@ -6454,7 +6454,7 @@ Note.prototype.stop = function () {
 
 // CellMorph inherits from BoxMorph:
 
-CellMorph.prototype = new BoxMorph();
+CellMorph.prototype = Object.create(BoxMorph.prototype);
 CellMorph.prototype.constructor = CellMorph;
 CellMorph.uber = BoxMorph.prototype;
 
@@ -6794,7 +6794,7 @@ CellMorph.prototype.mouseClickLeft = function (pos) {
 
 // WatcherMorph inherits from BoxMorph:
 
-WatcherMorph.prototype = new BoxMorph();
+WatcherMorph.prototype = Object.create(BoxMorph.prototype);
 WatcherMorph.prototype.constructor = WatcherMorph;
 WatcherMorph.uber = BoxMorph.prototype;
 
@@ -7281,7 +7281,7 @@ WatcherMorph.prototype.drawNew = function () {
 
 // StagePrompterMorph inherits from BoxMorph:
 
-StagePrompterMorph.prototype = new BoxMorph();
+StagePrompterMorph.prototype = Object.create(BoxMorph.prototype);
 StagePrompterMorph.prototype.constructor = StagePrompterMorph;
 StagePrompterMorph.uber = BoxMorph.prototype;
 
diff --git a/paint.js b/paint.js
index 65ae1f6..b4c55b1 100644
--- a/paint.js
+++ b/paint.js
@@ -81,7 +81,7 @@ var PaintColorPickerMorph;
 
 // A complete paint editor
 
-PaintEditorMorph.prototype = new DialogBoxMorph();
+PaintEditorMorph.prototype = Object.create(DialogBoxMorph.prototype);
 PaintEditorMorph.prototype.constructor = PaintEditorMorph;
 PaintEditorMorph.uber = DialogBoxMorph.prototype;
 
@@ -476,7 +476,7 @@ PaintEditorMorph.prototype.getUserColor = function () {
 
 // A large hsl color picker
 
-PaintColorPickerMorph.prototype = new Morph();
+PaintColorPickerMorph.prototype = Object.create(Morph.prototype);
 PaintColorPickerMorph.prototype.constructor = PaintColorPickerMorph;
 PaintColorPickerMorph.uber = Morph.prototype;
 
@@ -552,7 +552,7 @@ PaintColorPickerMorph.prototype.mouseMove =
     modify its image, based on a 'tool' property.
 */
 
-PaintCanvasMorph.prototype = new Morph();
+PaintCanvasMorph.prototype = Object.create(Morph.prototype);
 PaintCanvasMorph.prototype.constructor = PaintCanvasMorph;
 PaintCanvasMorph.uber = Morph.prototype;
 
diff --git a/store.js b/store.js
index 5cba3c3..6f3bc23 100644
--- a/store.js
+++ b/store.js
@@ -246,7 +246,7 @@ var SnapSerializer;
 
 // SnapSerializer inherits from XML_Serializer:
 
-SnapSerializer.prototype = new XML_Serializer();
+SnapSerializer.prototype = Object.create(XML_Serializer.prototype);
 SnapSerializer.prototype.constructor = SnapSerializer;
 SnapSerializer.uber = XML_Serializer.prototype;
 
diff --git a/widgets.js b/widgets.js
index bb250a8..2f96f2c 100644
--- a/widgets.js
+++ b/widgets.js
@@ -91,7 +91,7 @@ var InputFieldMorph;
 
 // PushButtonMorph inherits from TriggerMorph:
 
-PushButtonMorph.prototype = new TriggerMorph();
+PushButtonMorph.prototype = Object.create(TriggerMorph.prototype);
 PushButtonMorph.prototype.constructor = PushButtonMorph;
 PushButtonMorph.uber = TriggerMorph.prototype;
 
@@ -476,7 +476,7 @@ PushButtonMorph.prototype.createLabel = function () {
 
 // ToggleButtonMorph inherits from PushButtonMorph:
 
-ToggleButtonMorph.prototype = new PushButtonMorph();
+ToggleButtonMorph.prototype = Object.create(PushButtonMorph.prototype);
 ToggleButtonMorph.prototype.constructor = ToggleButtonMorph;
 ToggleButtonMorph.uber = PushButtonMorph.prototype;
 
@@ -900,7 +900,7 @@ ToggleButtonMorph.prototype.show = function () {
 
 // TabMorph inherits from ToggleButtonMorph:
 
-TabMorph.prototype = new ToggleButtonMorph();
+TabMorph.prototype = Object.create(ToggleButtonMorph.prototype);
 TabMorph.prototype.constructor = TabMorph;
 TabMorph.uber = ToggleButtonMorph.prototype;
 
@@ -1022,7 +1022,7 @@ TabMorph.prototype.drawEdges = function (
 
 // ToggleMorph inherits from PushButtonMorph:
 
-ToggleMorph.prototype = new PushButtonMorph();
+ToggleMorph.prototype = Object.create(PushButtonMorph.prototype);
 ToggleMorph.prototype.constructor = ToggleMorph;
 ToggleMorph.uber = PushButtonMorph.prototype;
 
@@ -1270,7 +1270,7 @@ ToggleMorph.prototype.show = ToggleButtonMorph.prototype.show;
 
 // ToggleElementMorph inherits from TriggerMorph:
 
-ToggleElementMorph.prototype = new TriggerMorph();
+ToggleElementMorph.prototype = Object.create(TriggerMorph.prototype);
 ToggleElementMorph.prototype.constructor = ToggleElementMorph;
 ToggleElementMorph.uber = TriggerMorph.prototype;
 
@@ -1440,7 +1440,7 @@ ToggleElementMorph.prototype.mouseClickLeft
 
 // DialogBoxMorph inherits from Morph:
 
-DialogBoxMorph.prototype = new Morph();
+DialogBoxMorph.prototype = Object.create(Morph.prototype);
 DialogBoxMorph.prototype.constructor = DialogBoxMorph;
 DialogBoxMorph.uber = Morph.prototype;
 
@@ -2866,7 +2866,7 @@ DialogBoxMorph.prototype.outlinePathBody = function (context, radius) {
 
 // AlignmentMorph inherits from Morph:
 
-AlignmentMorph.prototype = new Morph();
+AlignmentMorph.prototype = Object.create(Morph.prototype);
 AlignmentMorph.prototype.constructor = AlignmentMorph;
 AlignmentMorph.uber = Morph.prototype;
 
@@ -2940,7 +2940,7 @@ AlignmentMorph.prototype.fixLayout = function () {
 
 // InputFieldMorph inherits from Morph:
 
-InputFieldMorph.prototype = new Morph();
+InputFieldMorph.prototype = Object.create(Morph.prototype);
 InputFieldMorph.prototype.constructor = InputFieldMorph;
 InputFieldMorph.uber = Morph.prototype;
 
diff --git a/xml.js b/xml.js
index fb612ce..d1cdf68 100644
--- a/xml.js
+++ b/xml.js
@@ -166,7 +166,7 @@ ReadStream.prototype.word = function () {
 
 // XML_Element inherits from Node:
 
-XML_Element.prototype = new Node();
+XML_Element.prototype = Object.create(Node.prototype);
 XML_Element.prototype.constructor = XML_Element;
 XML_Element.uber = Node.prototype;