diff --git a/src/js/development/block.js b/src/js/development/block.js
index 0377649..39a4c59 100644
--- a/src/js/development/block.js
+++ b/src/js/development/block.js
@@ -8,7 +8,7 @@
       this.init.apply(this, arguments);
     }
   };
-  Block.prototype = new Expression();;
+  Block.prototype = new Expression();
   Block.prototype.block = function () {
     var _this = this;
     var dst_tmpl;
diff --git a/src/js/development/class.js b/src/js/development/class.js
index c14f0e8..b32c5be 100644
--- a/src/js/development/class.js
+++ b/src/js/development/class.js
@@ -10,7 +10,7 @@
       this.init.apply(this, arguments);
     }
   };
-  Class.prototype = new Block();;
+  Class.prototype = new Block();
   Class.prototype.init = function () {
     var _this = this;
     _this.instanceVariables = {};
@@ -19,17 +19,16 @@
   Class.prototype.classHeader = function () {
     var _this = this;
     var dst_tmpl;
-    dst_tmpl = "var %className%;\n%className% = function () { %variableInitialization%if (this.init) { this.init.apply(this, arguments); } };\n%className%.prototype = new %superClass%()";
+    dst_tmpl = "%className% = function () { %variableInitialization%if (this.init) { this.init.apply(this, arguments); } };\n%className%.prototype = new %superClass%()";
     return _this.cacheaParser("classHeader", function () {
       var className, superClass, variables, v_init;
-      _this.optional(function () {
-        return _this.chr("+");
-      });
-      superClass = _this.variable();
+      className = _this.variable();
       _this.skipSpace();
-      _this.string("subclass:");
+      _this.assignmentArrow();
+      _this.skipSpace();
+      superClass = _this.variable();
       _this.skipSpace();
-      className = _this.variablableStringContent();
+      _this.string("subclass");
       _this.skipSpace();
       _this.string("variables:");
       _this.skipSpace();
diff --git a/src/js/development/expression.js b/src/js/development/expression.js
index a9a68d7..ebe6551 100644
--- a/src/js/development/expression.js
+++ b/src/js/development/expression.js
@@ -10,7 +10,7 @@
       this.init.apply(this, arguments);
     }
   };
-  Expression.prototype = new LittleParser();;
+  Expression.prototype = new LittleParser();
   Expression.prototype.init = function () {
     var _this = this;
     return _this.bundledMethods = [];
diff --git a/src/js/development/littleparser.js b/src/js/development/littleparser.js
index 6b4f434..47589ad 100644
--- a/src/js/development/littleparser.js
+++ b/src/js/development/littleparser.js
@@ -8,7 +8,7 @@
       this.init.apply(this, arguments);
     }
   };
-  LittleParser.prototype = new Packrat();;
+  LittleParser.prototype = new Packrat();
   LittleParser.prototype.space = function () {
     var _this = this;
     return _this.cacheaParser("space", function () {
diff --git a/src/js/development/littlesmallscript.js b/src/js/development/littlesmallscript.js
index 4d12ebf..1170662 100644
--- a/src/js/development/littlesmallscript.js
+++ b/src/js/development/littlesmallscript.js
@@ -12,7 +12,7 @@
       this.init.apply(this, arguments);
     }
   };
-  LittleSmallscript.prototype = new Statement();;
+  LittleSmallscript.prototype = new Statement();
   LittleSmallscript.prototype.initWithInputandOptions = function (text, opt) {
     var _this = this;
     _this.input = text;
diff --git a/src/js/development/optimization.js b/src/js/development/optimization.js
index 2c3af29..731d458 100644
--- a/src/js/development/optimization.js
+++ b/src/js/development/optimization.js
@@ -46,7 +46,9 @@
           }), v.variable);
         })();
       } catch (err) {
-        _ret = function () {}(err);
+        _ret = function () {
+          return null;
+        }(err);
       }
       return _ret;
     })();
diff --git a/src/js/development/packrat.js b/src/js/development/packrat.js
index 60d98ee..39c3152 100644
--- a/src/js/development/packrat.js
+++ b/src/js/development/packrat.js
@@ -22,7 +22,7 @@
       this.init.apply(this, arguments);
     }
   };
-  Packrat.prototype = new Object();;
+  Packrat.prototype = new Object();
   Packrat.prototype.init = function (text) {
     var _this = this;
     _this.input = text;
@@ -54,7 +54,9 @@
     fn = (fn !== undefined) ? ((function () {
       return fn;
     }))() : (function () {
-      return function () {};
+      return function () {
+        return null;
+      };
     })();
     c = {};
     (_this.logNest += 1);
@@ -207,7 +209,9 @@
           return f = false;
         })();
       } catch (err) {
-        _ret = function () {}(err);
+        _ret = function () {
+          return null;
+        }(err);
       }
       return _ret;
     })();
@@ -231,7 +235,9 @@
           return f = true;
         })();
       } catch (err) {
-        _ret = function () {}(err);
+        _ret = function () {
+          return null;
+        }(err);
       }
       return _ret;
     })();
diff --git a/src/js/development/statement.js b/src/js/development/statement.js
index 5f97668..69e4185 100644
--- a/src/js/development/statement.js
+++ b/src/js/development/statement.js
@@ -8,7 +8,7 @@
       this.init.apply(this, arguments);
     }
   };
-  Statement.prototype = new Class();;
+  Statement.prototype = new Class();
   Statement.prototype.statement = function () {
     var _this = this;
     return _this.cacheaParser("statement", function () {
@@ -26,9 +26,7 @@
         var a;
         a = _this.statementable();
         _this.skipSpace();
-        _this.optional(function () {
-          return _this.chr(".");
-        });
+        _this.chr(".");
         _this.skipSpace();
         _this.followedBy(function () {
           return _this.statementable();
diff --git a/src/main.js b/src/main.js
index 8aebd68..81f68a6 100644
--- a/src/main.js
+++ b/src/main.js
@@ -5,7 +5,7 @@
 
   var LittleSmallscript, fs, optimist, argv, readline, rl, help;
   
-  LittleSmallscript = require("./js/production/littlesmallscript").LittleSmallscript;
+  LittleSmallscript = require("./js/production/littlesmallscript");
   
   fs = require('fs');
 
diff --git a/src/st/class.st b/src/st/class.st
index fe56c35..ff31c22 100644
--- a/src/st/class.st
+++ b/src/st/class.st
@@ -14,20 +14,20 @@ init
   instanceVariables := #{}.
   currentClass := null
 !.
-"Animal subclass: #Snake variables: #(#name #colour #awake)"
+"Snake := Animal subclass variables: #(#name #colour)"
 !Class
 classHeader | dst_tmpl |
   dst_tmpl := 
-'var %className%;
-%className% = function () { %variableInitialization%if (this.init) { this.init.apply(this, arguments); } };
+'%className% = function () { %variableInitialization%if (this.init) { this.init.apply(this, arguments); } };
 %className%.prototype = new %superClass%()'.
   self cache: #classHeader aParser: [| className superClass variables v_init |
-    self optional: [self chr: '+']. "LSt compatibility"
-    superClass := self variable.
+    className := self variable.
     self skipSpace.
-    self string: 'subclass:'.
+    self assignmentArrow.
+    self skipSpace.
+    superClass := self variable.
     self skipSpace.
-    className := self variablableStringContent.
+    self string: 'subclass'.
     self skipSpace.
     self string: 'variables:'.
     self skipSpace.