js test too

[DenisNosov22]

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[mateacademy-ai-mentor]

Review Summary

Great job implementing the core logic for state transformation and ensuring the original state is not mutated! Your solution works correctly.

However, this requires changes because it doesn't follow a couple of key requirements from the checklist. The implementation uses a series of if statements instead of the required switch statement to handle different action types. This violates two checklist items:

1. [CHECKLIST ITEM #2]: You must use a switch statement for a limited number of conditions.
2. [CHECKLIST ITEM #3]: The switch statement must include a default case for error handling.

Please refactor your code to use a switch statement based on action.type and add a default case to handle any unexpected actions.

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[mateacademy-ai-mentor]

This series of if statements should be refactored into a switch statement based on action.type.

This violates two checklist items:

1. Checklist item sol #2: '[CODE STYLE]: Use switch statement if you have limited amount of conditions.'
2. Checklist item Kisilov_Vadim #3: '[CODE STYLE]: switch/case should always have default case for error handling.'

A switch statement would be more appropriate here and would allow you to include a default case for any unexpected action types.

[mateacademy-ai-mentor]

Review Summary

Excellent work refactoring your code to use a switch statement! Your solution correctly implements all the required logic, so I am approving your submission.

There is one important improvement to make your code more robust. The task requires pushing a copy of the state to the history. While your current implementation works because each case reassigns currentState, pushing a direct reference can lead to subtle bugs if the state update logic changes in the future. To prevent this, you should always push an explicit copy like this:

history.push({ ...currentState });

This ensures each element in the history array is a distinct snapshot. Keep this in mind for future tasks. Great job!

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[mateacademy-ai-mentor]

This implementation works because each case in your switch statement creates a new object and reassigns it to currentState. However, this is not a very robust approach. The task requires pushing a copy of the state to the history.

If you were to later change one of the cases to mutate currentState directly, all previous states in the history array would also be changed. To prevent such bugs and follow the requirement, you should always push an explicit copy: history.push({ ...currentState });.