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..35b47bd68 100644
--- a/src/transformState.js
+++ b/src/transformState.js
@@ -5,7 +5,40 @@
  * @param {Object[]} actions
  */
 function transformState(state, actions) {
-  // write code here
+  for (const key of actions) {
+
+    if (key.type === 'addProperties') {
+      add(state, key.extraData);
+    }
+
+    if (key.type === 'clear') {
+      clear(state);
+    }
+
+    if (key.type === 'removeProperties') {
+      remove(state, key.keysToRemove);
+    }
+  }
 }
 
+const add = (state, obj) => {
+  for (const key in obj) {
+    state[key] = obj[key];
+  }
+
+  return state;
+};
+
+const clear = (state) => {
+  for (const key in state) {
+    delete state[key];
+  }
+};
+
+const remove = (state, keys) => {
+  for (const key of keys) {
+    delete state[key];
+  }
+};
+
 module.exports = transformState;