diff --git a/src/transformState.js b/src/transformState.js
index a1eaa064..36ac56c3 100644
--- a/src/transformState.js
+++ b/src/transformState.js
@@ -5,7 +5,25 @@
  * @param {Object[]} actions
  */
 function transformState(state, actions) {
-  // write code here
+  for (const action of actions) {
+    const { type } = action;
+
+    if (type === 'addProperties') {
+      const { extraData } = action;
+
+      Object.assign(state, extraData);
+    } else if (type === 'removeProperties') {
+      const { keysToRemove } = action;
+
+      for (const key of keysToRemove) {
+        delete state[key];
+      }
+    } else if (type === 'clear') {
+      for (const key in state) {
+        delete state[key];
+      }
+    }
+  }
 }
 
 module.exports = transformState;