- more!

app/reducers/activeItem.js

@@ -0,0 +1,12 @@
+import { SET_ACTIVE_ITEM, UNSET_ACTIVE_ITEM } from '../constants/actionTypes.js';
+
+export const activeItem = (state = null, action) => {
+  switch (action.type) {
+    case SET_ACTIVE_ITEM:
+      return action.payload;
+    case UNSET_ACTIVE_ITEM:
+      return null;
+    default:
+      return state;
+  }
+};