diff --git a/src/transformState.js b/src/transformState.js
index a1eaa064..fbdba165 100644
--- a/src/transformState.js
+++ b/src/transformState.js
@@ -5,7 +5,35 @@
  * @param {Object[]} actions
  */
 function transformState(state, actions) {
-  // write code here
+  for (const action of actions) {
+    const { type, extraData, keysToRemove } = action;
+
+    switch (type) {
+      case 'clear': {
+        for (const s in state) {
+          delete state[s];
+        }
+        break;
+      }
+
+      case 'addProperties': {
+        Object.assign(state, extraData);
+        break;
+      }
+
+      case 'removeProperties': {
+        for (const key of keysToRemove) {
+          delete state[key];
+        }
+        break;
+      }
+
+      default:
+        return 'Unexpected action';
+    };
+  };
+
+  return state;
 }
 
 module.exports = transformState;