Calculator Application Solution - Anthony Chablov

I am most proud of my implementation of seamless user interaction with mobile responsiveness, significantly improving user experience. I ensured the calculator hook logic is robust and handles various operations smoothly. My understanding and application of user interaction principles and testing fundamentals have definitely improved. Furthermore, I focused on establishing a clear project structure and adhering to clean code principles, including aspects of SOLID where applicable, to create a maintainable and organized code-base with thorough unit-testing.

A primary challenge I encountered revolved around handling the various edge cases inherent in mathematical calculations within the calculator logic. For instance, managing consecutive operators, preventing division by zero, and ensuring correct order of operations required careful consideration. My custom useCalculator hook implementation reflects the effort to address these challenges through specific conditional logic within the handleButtonClick and onEvaluate functions. This included sanitizing the expression before evaluation to handle scenarios like "9++" or trailing operators, and implementing error handling for division by zero and invalid results. The use of the expr-eval library significantly simplified the actual evaluation of the mathematical expressions while still requiring robust pre-processing and post-processing to handle the UI-specific input and output requirements.