In Functional Programming, is it considered a bad practice to have incomplete pattern matchings

Question

Is it generally considered a bad practice to use non-exhaustive pattern machings in functional languages like Haskell or F#, which means that the cases specified don\'t cove

Answer 1

Explicit is better than implicit (borrowed from the Zen of Python ;))

It's exactly the same as in a C switch over an enum... It's better to write all the cases (with a fall through) rather than just putting a default, because the compiler will tell you if you add new elements to the enumeration and you forgot to handle them.