diff --git a/package.json b/package.json
index e83fa6dc7..55e4ae2de 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "*",
-    "@mate-academy/scripts": "^0.3.5",
+    "@mate-academy/scripts": "^1.2.8",
     "eslint": "^5.16.0",
     "eslint-plugin-jest": "^22.4.1",
     "eslint-plugin-node": "^8.0.1",
diff --git a/src/transformState.js b/src/transformState.js
index a1eaa0640..5eb215dbf 100644
--- a/src/transformState.js
+++ b/src/transformState.js
@@ -5,7 +5,27 @@
  * @param {Object[]} actions
  */
 function transformState(state, actions) {
-  // write code here
+  for (const action of actions) {
+    switch (action.type) {
+      case 'addProperties':
+        Object.assign(state, action.extraData);
+        break;
+
+      case 'clear':
+        for (const key in state) {
+          delete state[key];
+        };
+        break;
+
+      case 'removeProperties':
+        for (const keyToRemove of action.keysToRemove) {
+          delete state[keyToRemove];
+        };
+        break;
+
+      default: continue;
+    }
+  }
 }
 
 module.exports = transformState;