string to list haskell
To convert a string to a list in Haskell, you can use the Data.List
module, specifically the Data.List.split
function. Here is an example:
import Data.List (split)
stringToList :: String -> [Char]
stringToList str = split str
In this example, the split
function takes a string str
as input and returns a list of characters. The resulting list will contain each character of the input string as a separate element.
Alternatively, you can use the Data.List
module's Data.List.unfoldr
function to achieve the same result:
import Data.List (unfoldr)
stringToList :: String -> [Char]
stringToList str = unfoldr (\x -> case x of [] -> Nothing; (y:ys) -> Just (y, ys)) str
This implementation uses the unfoldr
function to generate a list by repeatedly applying a function to a seed value. In this case, the function checks if the input string str
is empty. If it is, it returns Nothing
to stop the generation of the list. Otherwise, it returns Just (y, ys)
, where y
is the first character of the string and ys
is the remaining characters.
Both implementations will convert a string to a list of characters in Haskell.