Minor refactor

react-test.rb

@@ -1,26 +1,15 @@
 require './react'
 
-class Observer
-  def initialize(&proc)
-    @proc = proc
-    run
-  end
+include React
 
-  def run
-    ctx = React::Context.new
-    ctx.on_invalidate do
-      run
-    end
-    ctx.run &@proc
-  end
-end
+sess = Session.new
+sess.set('user', '')
 
-sess = React::Session.new
-user = React::ObservableValue.new { sess.get('user') }
-upUser = React::ObservableValue.new { (user.get||'').upcase }
+user = ObservableValue.new { sess.get('user') }
+upUser = ObservableValue.new { user.get.upcase }
 Observer.new { puts upUser.get }
 
 sess.set('user', 'jcheng')
-React::Context.flush
+Context.flush
 sess.set('user', 'jjallaire')
-React::Context.flush
+Context.flush

react.rb

@@ -114,6 +114,7 @@ module React
     end
   end
 
+  # Stores (and caches) a single dependent value in a context
   class ObservableValue
     def initialize(&valueProc)
       @valueProc = valueProc
@@ -150,4 +151,20 @@ module React
       end
   end
 
+  # Runs the given proc whenever its dependencies change
+  class Observer
+    def initialize(&proc)
+      @proc = proc
+      run
+    end
+
+    def run
+      ctx = React::Context.new
+      ctx.on_invalidate do
+        run
+      end
+      ctx.run &@proc
+    end
+  end
+
 end