Edge Case Handling

Edge cases are inputs at the boundaries of what's valid. They're where bugs hide and where robust code proves its worth. Professional developers think about edge cases BEFORE writing code. Defensive Programming Handle edge cases explicitly at the start of your functions. This makes your intentions clear and prevents crashes. Common Pitfalls These edge cases cause the most bugs: Defensive programming at function boundaries -- validating inputs before using them -- prevents a whole class of crashes. Guard clauses that return early for invalid inputs keep the main logic clean and readable.