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

Non-exhaustive pattern machings are idiomatic in Haskell but extremely bad style in F# (and OCaml, Standard ML etc.).

Exhaustiveness checking is a very valuable way to catch errors at compile time in strict languages like F# but lazy languages like Haskell often use infinite lazy lists where the empty list cannot arise so they (historically) chose brevity over statically-checked correctness.