Write Exceptions

Contributed by: Maximiliano Contieri

Difficulty level: Beginner

Handling exceptions is fundamental. Well-crafted exception handling ensures that your code is resilient, maintainable, and predictable. Exceptions represent unexpected conditions in a program. Good exception handling separates error-handling logic from regular code flow, making your code cleaner and easier to understand.

Why You Should Use Exceptions Instead of Return Codes

Exceptions are a fundamental concept in modern programming, acting as safety nets that catch errors and prevent program crashes. Writing effective exceptions, however, goes beyond simply throwing a generic “Error” message. It’s about crafting informative and well-defined exceptions that enhance code readability, maintainability, and program robustness.

When you throw an exception, the normal flow of the program is interrupted and control is transferred to a specific exception handler. Keeping the expected path logic clean is one of the pillars of clean code. Exceptions separate the normal flow of control from exceptional conditions.

Avoid Return Codes

Exceptions provide a structured way to handle errors and exceptional conditions. When an exception is thrown, you can catch it at an appropriate level in the call stack and take action to handle the error, log it, or recover from it. If you use return codes, you will need to check every level of the call stack to handle errors explicitly by checking return values. If you miss ...