The map method only accepts a lambda that doesn’t throw any checked exceptions, so we can’t directly call our readFileOrFail method. Ideally it would be able to generically say “I throw the same exceptions as the lambda I receive” but you can’t do that in the Java type system.
it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
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Андрей Стрельцов (Редактор отдела «Спорт»)