小编Jos*_*ega的帖子

当满足条件时，我试图从记录列表中返回单个记录。现在，当条件为假时，我正在返回一条包含空字段的记录。

这个可以吗？有没有更好的办法？

xs =
    [ { name = "Mike", id = 1 }
    , { name = "Paul", id = 2 }
    , { name = "Susan", id = 3 }
    ]


getNth id xs =
    let
        x =
            List.filter (\i -> i.id == id) xs
    in
        case List.head x of
            Nothing ->
                { name = "", id = 0 }

            Just item ->
                item