This also comes easy, if you are using a more expressive language: remove e [] = [] remove e (e:xs) = xs remove e (x:xs) = x : remove e xs This even

This also comes easy, if you are using a more expressive language: remove e [] = [] remove e (e:xs) = xs remove e (x:xs) = x : remove e xs This even has the benefit of making it very clear whether you've remembered the case where 'x' is not in the list.