Finished.

[abdukulov-talgat]

This time it's simpler.

[github-actions]

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[TheCSharpAcademy]

@abdukulov-talgat Project approved! 😄✅Well done for completing the challenges! You followed the tutorials and modified the code very effectively for the challenges. You also cleaned up the messy code from the tutorial quite a lot. Well done! 👏👏

Feedback
🔍️One thing I'd improve is the number validation:

Regex.IsMatch(str, "^p$|\\d+")

This doesn't properly support inputs such as negative numbers or decimals, despite the calculator using double. double.TryParse would be a much better fit and would simplify the validation at the same time.

🔍Improve file error handling. Loading calculator-log.json is protected by a try/catch, but Save() isn't. A file permission or disk error could therefore crash the application when performing or clearing a calculation.

🗺️ I saw you completed the Introduction to Object-Oriented Programming, I hope you enjoyed it! Next I recommend taking our LINQ Fundamentals course next. LINQ is one of the most important tools in modern C# and becoming comfortable with it will make your code much cleaner and more expressive.

☕If you like our roadmap, please consider buying us a coffee. We appreciate your help 🙂

Overall good work!✋🏻Looking forward to seeing your next projects!