PlusMinusSet

lab07/src/reducer.js

@@ -0,0 +1,17 @@
+const initialState = {
+  count: 100,
+  fifeTHousend: 5000,
+};
+
+export default function reducer(state = initialState, action) {
+  switch (action.type) {
+    case "count/increaseBy":
+      return { ...state, count: state.count + action.amount };
+    case "count/decreaseBy":
+      return { ...state, count: state.count - action.amount };
+    case "count/setToFiveThousand":
+      return { ...state, count: state.fifeTHousend };
+    default:
+      return state;
+  }
+}