removed all traces of 'extends' -- it's not any shorter or more convenient than just setting the prototype

documentation/cs/super.cs

@@ -3,13 +3,13 @@ Animal.prototype.move: meters =>
   alert(this.name + " moved " + meters + "m.").
 
 Snake: name => this.name: name.
-Snake extends new Animal()
+Snake.prototype: new Animal()
 Snake.prototype.move: =>
   alert("Slithering...")
   super(5).
 
 Horse: name => this.name: name.
-Horse extends new Animal()
+Horse.prototype: new Animal()
 Horse.prototype.move: =>
   alert("Galloping...")
   super(45).

documentation/js/array_comprehensions.js

@@ -1,4 +1,6 @@
 (function(){
+
+  // Eat lunch.
   var lunch;
   var a = ['toast', 'cheese', 'wine'];
   var d = [];
@@ -7,6 +9,7 @@
     d[b] = food.eat();
   }
   lunch = d;
+  // Zebra-stripe a table.
   var e = table;
   for (var f=0, g=e.length; f<g; f++) {
     var row = e[f];

documentation/js/expressions_assignment.js

@@ -1,3 +0,0 @@
-(function(){
-
-})();

documentation/js/intro.js

@@ -1,4 +1,6 @@
 (function(){
+
+  // CoffeeScript on the left, JS on the right.
   var square = function(x) {
     return x * x;
   };

documentation/js/punctuation.js

@@ -1,4 +1,8 @@
 (function(){
+
+  // Comments start with hash marks. Periods mark the end of a block.
   var left_hand = raining ? umbrella : parasol;
+  // To signal the beginning of the next expression,
+  // use "then", or a newline.
   left_hand = raining ? umbrella : parasol;
 })();

documentation/js/super.js

@@ -1,6 +1,5 @@
 (function(){
   var Animal = function() {
-
   };
   Animal.prototype.move = function(meters) {
     return alert(this.name + " moved " + meters + "m.");

documentation/js/switch.js

@@ -4,7 +4,9 @@
   } else if (day === "Wednesday") {
     go_to_the_park();
   } else if (day === "Saturday") {
-    day === bingo_day ? go_to_bingo() : null;
+    if (day === bingo_day) {
+      go_to_bingo();
+    };
   } else if (day === "Sunday") {
     go_to_church();
   } else {

examples/code.cs

@@ -145,13 +145,13 @@ Animal.prototype.move: meters =>
   alert(this.name + " moved " + meters + "m.").
 
 Snake: name => this.name: name.
-Snake extends Animal
+Snake.prototype: Animal
 Snake.prototype.move: =>
   alert('Slithering...')
   super(5).
 
 Horse: name => this.name: name.
-Horse extends Animal
+Horse.prototype: Animal
 Horse.prototype.move: =>
   alert('Galloping...')
   super(45).

index.html

@@ -275,7 +275,9 @@ lunch<span class="Keyword">:</span> food.eat() <span class="Keyword">for</span>
 
 <span class="Comment"><span class="Comment">#</span> Zebra-stripe a table.</span>
 highlight(row) <span class="Keyword">for</span> row, i <span class="Keyword">in</span> table <span class="Keyword">if</span> i <span class="Keyword">%</span> <span class="Number">2</span> <span class="Keyword">is</span> <span class="Number">0</span>.
-</pre><pre class="idle"><span class="Storage">var</span> lunch;
+</pre><pre class="idle">
+<span class="Comment"><span class="Comment">//</span> Eat lunch.</span>
+<span class="Storage">var</span> lunch;
 <span class="Storage">var</span> a <span class="Keyword">=</span> [<span class="String"><span class="String">'</span>toast<span class="String">'</span></span>, <span class="String"><span class="String">'</span>cheese<span class="String">'</span></span>, <span class="String"><span class="String">'</span>wine<span class="String">'</span></span>];
 <span class="Storage">var</span> d <span class="Keyword">=</span> [];
 <span class="Keyword">for</span> (<span class="Storage">var</span> b<span class="Keyword">=</span><span class="Number">0</span>, c<span class="Keyword">=</span>a.<span class="LibraryConstant">length</span>; b<span class="Keyword">&lt;</span>c; b<span class="Keyword">++</span>) {
@@ -283,6 +285,7 @@ highlight(row) <span class="Keyword">for</span> row, i <span class="Keyword">in<
   d[b] <span class="Keyword">=</span> food.eat();
 }
 lunch <span class="Keyword">=</span> d;
+<span class="Comment"><span class="Comment">//</span> Zebra-stripe a table.</span>
 <span class="Storage">var</span> e <span class="Keyword">=</span> table;
 <span class="Keyword">for</span> (<span class="Storage">var</span> f<span class="Keyword">=</span><span class="Number">0</span>, g<span class="Keyword">=</span>e.<span class="LibraryConstant">length</span>; f<span class="Keyword">&lt;</span>g; f<span class="Keyword">++</span>) {
   <span class="Storage">var</span> row <span class="Keyword">=</span> e[f];
@@ -333,7 +336,6 @@ tom<span class="Keyword">:</span> <span class="Keyword">new</span> <span class="
 sam.move()
 tom.move()
 </pre><pre class="idle"><span class="Storage">var</span> <span class="FunctionName">Animal</span> = <span class="Storage">function</span>() {
-
 };
 <span class="LibraryClassType">Animal</span>.<span class="LibraryConstant">prototype</span>.<span class="FunctionName">move</span> = <span class="Storage">function</span>(<span class="FunctionArgument">meters</span>) {
   <span class="Keyword">return</span> <span class="LibraryFunction">alert</span>(<span class="Variable">this</span>.<span class="LibraryConstant">name</span> <span class="Keyword">+</span> <span class="String"><span class="String">&quot;</span> moved <span class="String">&quot;</span></span> <span class="Keyword">+</span> meters <span class="Keyword">+</span> <span class="String"><span class="String">&quot;</span>m.<span class="String">&quot;</span></span>);
@@ -359,7 +361,6 @@ tom.move()
 sam.move();
 tom.move();
 </pre><button onclick='javascript: var Animal = function() {
-
 };
 Animal.prototype.move = function(meters) {
   return alert(this.name + " moved " + meters + "m.");
@@ -429,7 +430,9 @@ if (10 > 9) {
 } <span class="Keyword">else</span> <span class="Keyword">if</span> (day <span class="Keyword">===</span> <span class="String"><span class="String">&quot;</span>Wednesday<span class="String">&quot;</span></span>) {
   go_to_the_park();
 } <span class="Keyword">else</span> <span class="Keyword">if</span> (day <span class="Keyword">===</span> <span class="String"><span class="String">&quot;</span>Saturday<span class="String">&quot;</span></span>) {
-  day <span class="Keyword">===</span> bingo_day ? go_to_bingo() : <span class="BuiltInConstant">null</span>;
+  <span class="Keyword">if</span> (day <span class="Keyword">===</span> bingo_day) {
+    go_to_bingo();
+  };
 } <span class="Keyword">else</span> <span class="Keyword">if</span> (day <span class="Keyword">===</span> <span class="String"><span class="String">&quot;</span>Sunday<span class="String">&quot;</span></span>) {
   go_to_church();
 } <span class="Keyword">else</span> {

lib/coffee_script/CoffeeScript.tmbundle/Syntaxes/CoffeeScript.tmLanguage

@@ -229,7 +229,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>\b(super|this|extends)\b</string>
+			<string>\b(super|this)\b</string>
 			<key>name</key>
 			<string>variable.language.cs</string>
 		</dict>

lib/coffee_script/grammar.y

@@ -10,7 +10,7 @@ token TRY CATCH FINALLY THROW
 token BREAK CONTINUE
 token FOR IN WHILE
 token SWITCH CASE
-token EXTENDS SUPER
+token SUPER
 token DELETE
 token NEWLINE
 token COMMENT
@@ -30,7 +30,7 @@ prechigh
   right    DELETE
   left     "."
   right    THROW FOR IN WHILE NEW
-  left     UNLESS IF ELSE EXTENDS
+  left     UNLESS IF ELSE
   left     ":"
   right    RETURN
 preclow
@@ -69,7 +69,6 @@ rule
   | Call
   | Code
   | Operation
-  | Extend
   ;
 
   # We have to take extra care to convert these statements into expressions.
@@ -255,11 +254,6 @@ rule
     SUPER "(" ArgList ")"             { result = CallNode.new(:super, val[2]) }
   ;
 
-  # Extending a class.
-  Extend:
-    IDENTIFIER EXTENDS Expression     { result = ExtendNode.new(val[0], val[2]) }
-  ;
-
   # The array literal.
   Array:
     "[" ArgList "]"                   { result = ArrayNode.new(val[1]) }

lib/coffee_script/lexer.rb

@@ -14,7 +14,7 @@ module CoffeeScript
                   "break", "continue",
                   "for", "in", "while",
                   "switch", "case",
-                  "extends", "super",
+                  "super",
                   "delete"]
 
     # Token matching regexes.

lib/coffee_script/nodes.rb

@@ -213,21 +213,6 @@ module CoffeeScript
     end
   end
 
-  class ExtendNode < Node
-
-    attr_reader :subclass, :superclass
-
-    def initialize(subclass, superclass)
-      @subclass, @superclass = subclass, superclass
-    end
-
-    def compile(o={})
-      o = super(o)
-      "#{@subclass}.prototype = #{@superclass.compile(o)}"
-    end
-
-  end
-
   # A value, indexed or dotted into, or vanilla.
   class ValueNode < Node
     attr_reader :literal, :properties, :last