Module description
fromList : List a -> RollingList a
Create a rolling list from a normal list
toList (fromList [1,2,3])
--> [1,2,3]
roll : RollingList a -> RollingList a
Return a New RollingList, with the current element set to the next element
toList (roll (fromList [1,2,3]))
--> [2,3,1]
current (roll (fromList [1,2,3]))
--> Just 2
current (fromList [1, 2] |> roll |> roll)
--> Just 1
current (fromList [1] |> roll |> roll |> roll)
--> Just 1
rollBack : RollingList a -> RollingList a
Return a New RollingList, with the current element set to the previous element
toList (rollBack (fromList [1,2,3]))
--> [3,1,2]
current (rollBack (fromList [1,2,3]))
--> Just 3
current : RollingList a -> Maybe a
Returns the currently selected element in the list
current (fromList [1,2,3])
--> Just 1
current (fromList [])
--> Nothing
toList : RollingList a -> List a
Create a normal list from a rolling list
toList (fromList [1,2])
--> [1,2]
{ previous : List a
, next : List a
}
The rolling list type.