Side effects are not allowed in functional style programming. Exceptions are side effects, it doesn't matter whether they are checked or unchecked exceptions.

Side effects are not allowed in functional style programming. Exceptions are side effects, it doesn't matter whether they are checked or unchecked exceptions. https://jessewarden.com/2021/07/why-functional-programmers-avoid-exceptions.html https://jessewarden.com/2021/07/why-functional-programmers-a... While composing methods in stream style is convenient, methods that can throw exceptions warrant more careful coding, so convenience should not always be the priority.