More react reducer patterns improvements

Author: RoyalIcing

lib/components_guide_web/templates/react_typescript/reducer-patterns.html.md

@@ -1,4 +1,4 @@
-# React `useReducer` patterns
+# React Reducer Patterns
 
 ## Menu
 
@@ -27,3 +27,13 @@ tap("edit") // "edit"
 tap("edit") // null
 tap(null) // null
 ```
+
+You can of course condense it to a ternary if you want:
+
+```ts
+// You can of course shorten it into a ternary if you really want:
+const [openMenu, tap] = useReducer(
+  (current: Menu, action: Menu) => (action === current) ? null : action,
+  null
+);
+```