Just show me one learner’s book where error handling is rigorously designed from the start and consequently used through all the examples, without being left out for brevity and readability and as exercise for the reader. If this is applicable from an educational POV, that is another question, but it’s no surprise that error handling is often enough a second or third thought when it should be the very first.

via What’s preferable: Exceptions or explicit error testing? | Ars Technica.