June 2018 Update

Task/Delegates/Sidef/delegates.sidef

@@ -0,0 +1,25 @@
+class NonDelegate { }
+
+class Delegate {
+    method thing {
+        return "delegate implementation"
+    }
+}
+
+class Delegator (delegate = null) {
+    method operation {
+
+        if (delegate.respond_to(:thing)) {
+            return delegate.thing
+        }
+
+        return "default implementation"
+    }
+}
+
+var d = Delegator()
+say "empty: #{d.operation}"
+d.delegate = NonDelegate()
+say "NonDelegate: #{d.operation}"
+d.delegate = Delegate()
+say "Delegate: #{d.operation}"