I can think of a variety of ways to put a value at the end of a list of the same type. -- cutesy-clever putAtEnd :: [a] -> a -> [a] putAtEnd xs x = reverse (x : reverse xs) -- by hand atEnd :: [a] -> a -> [a] atEnd [] z = [z] atEnd (x:xs) z = x : atEnd xs z -- obvious brute force infixr 9 +: (+:) :: [a] -> a -> [a] (+:) xs x = xs ++ [x] I'd appreciate feedback/advice on whether: 1) I've missed any clearly-better alternatives; 2) any of those is obviously better or worse than the others; 3) I should have known where to look for the answer myself (instead of brute-force Googling). I've semi-inadvertently mixed two issues above: infix-vs-prefix and algorithm design. TIA for suggestions on either. -jn- -- Beauty of style and harmony and grace and good rhythm depend on simplicity. - Plato