[crabbone]

Sorry. This is nonsense. map() is the bread and butter of any program. Besides, you cannot ever decide whether an exception is important or not -- it's always in the purview of the user.

Re-throwing a non-checked exception is what I described as the usual / typical coping mechanism in languages with checked exceptions. Which is obviously a way to negate the whole feature.

[breadwinner]

Sorry, disagree. map() didn't even exist in Java until recently. It is convenience at the cost of some safety. If you're writing a non-critical or throw away code you may not care about strong guarantees. Personally I prefer strong guarantees over convenience. I would only use map() for things that can't throw checked exceptions. A for loop isn't that hard to write.