diff --git a/src/transformState.js b/src/transformState.js
index a1eaa064..a3c68e11 100644
--- a/src/transformState.js
+++ b/src/transformState.js
@@ -1,11 +1,32 @@
 'use strict';
 
-/**
- * @param {Object} state
- * @param {Object[]} actions
- */
+
+  @param {Object} state
+  @param {Object[]} actions
+
 function transformState(state, actions) {
-  // write code here
+
+  for (const action of actions) {
+    const { type, extraData, keysToRemove } = action;
+
+    switch (type) {
+      case 'addProperties':
+        Object.assign(state, extraData);
+        break;
+
+      case 'removeProperties':
+        for (const key of keysToRemove) {
+          delete state[key];
+        }
+        break;
+
+      case 'clear':
+        for (const key in state) {
+          delete state[key];
+        }
+        break;
+    }
+  }
 }
 
 module.exports = transformState;