created function transform state with clones

[MykolaFatkullin]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Great job implementing the core logic for transforming the state! The function correctly handles the different action types and avoids mutating the original state. However, a few changes are needed to align with the project's coding standards before this can be approved.

Here are the key areas to address:

1. Error Handling: The default case in your switch statement should be more robust. Instead of resulting in an undefined state for unknown actions, it should throw an error to prevent potential bugs down the line [CHECKLIST ITEM #3].
2. Redundant Code: To follow the DRY principle, please create a copy of the state before the switch statement, rather than within each case. This avoids repeating the cloning logic [CHECKLIST ITEM #4].
3. Naming: The parameter name clone isn't very descriptive. A name that better reflects its purpose, such as sourceObject or previousState, would improve readability [CHECKLIST ITEM #5].

Once these points are addressed, your solution will be in great shape!

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[mateacademy-ai-mentor]

This violates checklist item #3: 'switch/case should always have default case for error handling'. While a default case is present, assigning undefined to resultObject for an unknown action type can lead to subtle bugs. A more robust way to handle this error would be to throw an exception, for example: throw new Error(Unknown action type: ${type});.

[mateacademy-ai-mentor]

This violates checklist item #5: '[NAMING] - use proper names for object copy'. The parameter name clone is not very descriptive. A name that better reflects its role, such as sourceObject or previousState, would improve code readability.

[mateacademy-ai-mentor]

Review Summary

Excellent work on this task! Your function correctly handles all action types, maintains immutability, and includes robust error handling as required. I am approving your solution because it meets all the core functional requirements.

For future improvement, consider how to avoid repeating code. In your switch statement, both the 'addProperties' and 'removeProperties' cases make a copy of the state. A more streamlined approach would be to make each case responsible for creating the entire new state object. This would make the logic for each action clearer and adhere more closely to the DRY (Don't Repeat Yourself) principle mentioned in [CHECKLIST ITEM #4].

Overall, this is a solid implementation. Well done!

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[mateacademy-ai-mentor]

This approach of initializing an empty object and populating it in the switch leads to repeated logic, which violates checklist item #4 ('[DONT REPEAT YOURSELF]'). Both the 'addProperties' case and the 'removeProperties' case need to make a copy of lastChangedObject.

Consider making each case responsible for creating the entire new state object and assigning it to a variable. This makes the logic for each action clearer and avoids duplicating the copying step.