toUpper array := map (x => uppercase x) array Why not just `map uppercase array` ? That way you don't even really need to define a function `toUpper array`. Is

toUpper array := map (x => uppercase x) array Why not just `map uppercase array` ? That way you don't even really need to define a function `toUpper array`. Isn't it customary not to mix lifting and program logic in functional programming languages? Filter example: notPrefixedWithA name := not contains (prefix name) ["a", "A"] then use filter notPrefixedWithA names