diff --git a/src/transformStateWithClones.js b/src/transformStateWithClones.js
index 96d4f7e7e..1c5d4ce04 100644
--- a/src/transformStateWithClones.js
+++ b/src/transformStateWithClones.js
@@ -7,7 +7,38 @@
  * @return {Object[]}
  */
 function transformStateWithClones(state, actions) {
-  // write code here
+  const history = [];
+  let prevState = state;
+
+  for (let i = 0; i < actions.length; i++) {
+    const action = actions[i];
+    let nextState;
+
+    switch (action.type) {
+      case 'addProperties':
+        nextState = Object.assign({}, prevState, action.extraData);
+        break;
+
+      case 'removeProperties':
+        nextState = Object.assign({}, prevState);
+
+        for (const k of action.keysToRemove) {
+          delete nextState[k];
+        }
+        break;
+
+      case 'clear':
+        nextState = {};
+        break;
+      default:
+        continue;
+    }
+
+    history.push(nextState);
+    prevState = nextState;
+  }
+
+  return history;
 }
 
 module.exports = transformStateWithClones;