- implementing immutable.js

app/reducers/auctions.js

@@ -0,0 +1,18 @@
+import { Map } from 'immutable';
+
+import { AUCTIONS_UPDATED, UPDATE_AUCTIONS } from '../constants/actionTypes.js';
+
+export const auctions = (state = new Map(), action) => {
+  switch (action.type) {
+    case AUCTIONS_UPDATED:
+      return state.merge(
+        action.payload.toMap().mapEntries((entry) => {
+          const [, item] = entry;
+          return [`${item.id}`, item];
+        }),
+      );
+    case UPDATE_AUCTIONS:
+    default:
+      return state;
+  }
+};