Redux boilerplate code

src/js/reducers/index.js

@@ -0,0 +1,17 @@
+import { ADD_ARTICLE } from "../constants/action-types"
+
+const initialState = {
+  articles: []
+}
+
+function rootReducer(state = initialState, action) {
+  if (action.type === ADD_ARTICLE) {
+		return Object.assign({}, state, {
+      articles: state.articles.concat(action.payload)
+    })
+	}
+
+  return state
+}
+
+export default rootReducer