Maybe MorphValue

Just content succeeds with the content, Nothing fails.

import Morph
import Char.Morph


Just 'Y'
    |> Morph.toNarrow
        (Char.Morph.only 'Y'
            |> Morph.over Maybe.Morph.toJust
        )
--> Ok ()

Try to Morph a value and return it as a Just. If something fails, go back to where you started and return Nothing

ℹ️ Equivalent regular expression: ?

import AToZ
import AToZ.Morph
import List.Morph
import Morph


-- maybe we get `Just` a letter
"a"
    |> Morph.toNarrow
        (Maybe.Morph.row (AToZ.Morph.lowerChar |> Morph.one)
            |> Morph.rowFinish
            |> Morph.over List.Morph.string
        )
--> Ok (Just AToZ.A)


-- maybe we get `Nothing`
""
    |> Morph.toNarrow
        (Maybe.Morph.row (AToZ.Morph.char |> Morph.one)
            |> Morph.rowFinish
            |> Morph.over List.Morph.string
        )
--> Ok Nothing