Maybe (pun intended) the catMaybes function from
http://package.elm-lang.org/packages/krisajenkins/elm-exts/25.13.0/Exts-Maybe
will help you.
It has a signature of:
catMaybes : List (Maybe a) -> List a
Which keeps all your Just a items in the list.
So adding a Nothing would be relatively straightforward:
myFunc : List (Maybe a) -> Maybe (List a)
myFunc listOfMaybes =
case catMaybes listOfMaybes of
[] ->
Nothing
aList ->
Just aList
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