liking and quoting work

twistter-frontend/redux/reducers/userReducer.js

@@ -0,0 +1,31 @@
+import { LIKE_POST, UNLIKE_POST} from '../types';
+
+const initialState = {
+    likes: [],
+    credentials: {}
+}
+
+export default function(state = initialState, action) {
+    switch (action.type) {
+        case LIKE_POST:
+            return {
+                ...state,
+                likes: [
+                    ...state.likes,
+                    {
+                        userHandle: state.credentials.handle,
+                        postId: action.payload.postId
+                    }
+                ]
+            }
+        case UNLIKE_POST:
+            return {
+                ...state,
+                likes: state.likes.filter(
+                    (like) => like.postId === action.payload.postId
+                )
+            };
+            default:
+                return state;
+    }
+}