Initial data commit

Task/Delegates/Dart/delegates.dart

@@ -0,0 +1,29 @@
+class Delegator {
+  var delegate;
+
+  String operation() {
+    if (delegate == null)
+      return "default implementation";
+    else
+      return delegate.thing();
+  }
+}
+
+class Delegate {
+  String thing() => "delegate implementation";
+}
+
+main() {
+  // Without a delegate:
+  Delegator a = new Delegator();
+  Expect.equals("default implementation",a.operation());
+
+  // any object doesn't work unless we can check for existing methods
+  // a.delegate=new Object();
+  // Expect.equals("default implementation",a.operation());
+
+  // With a delegate:
+  Delegate d = new Delegate();
+  a.delegate = d;
+  Expect.equals("delegate implementation",a.operation());
+}