stateful object solution

src/transformState.js

@@ -5,7 +5,36 @@
  * @param {Object[]} actions
  */
 function transformState(state, actions) {
-  // write code here
+  for (const action of actions) {
+    switch (action.type) {
+      case 'addProperties':
+        if (action.extraData) {
+          for (const [key, value] of Object.entries(action.extraData)) {
+            state[key] = value;
+          }
+        }
+        break;
+
+      case 'removeProperties':
+        if (action.keysToRemove) {
+          for (const key of action.keysToRemove) {
+            if (state.hasOwnProperty(key)) {
+              delete state[key];
+            }
+          }
+        }
+        break;
+
+      case 'clear':
+        for (const key in state) {
+          delete state[key];
+        }
+        break;
+
+      default:
+        break;
+    }
+  }
 }
 
 module.exports = transformState;