recursion - Iterating through a list of lists of 3-tuples in Haskell

Recursion - Iterating through a list of lists of 3-tuples in Haskell

To iterate through a list of lists of 3-tuples in Haskell using recursion, you can define a recursive function that pattern matches on the structure of the list. Here's an example:

iterateThrough :: [[(a, b, c)]] -> [c] iterateThrough [] = [] -- Base case: empty list iterateThrough (x:xs) = concatMap (\(_, _, z) -> [z]) x ++ iterateThrough xs

This function iterateThrough takes a list of lists of 3-tuples and returns a list of the third elements of each tuple.

Explanation:

  • The base case handles an empty list, where the result is also an empty list.
  • The recursive case pattern matches on a non-empty list (x:xs). Here, x represents the first list of 3-tuples, and xs represents the rest of the list.
  • Using concatMap, we extract the third element of each tuple in the first list x and concatenate them together.
  • We then recursively call iterateThrough on the rest of the list xs and concatenate the result with the previous one.

Example usage:

main :: IO () main = do let myList = [[(1, 2, 'a'), (3, 4, 'b')], [(5, 6, 'c'), (7, 8, 'd')]] print $ iterateThrough myList

Output:

"a" "b" "c" "d"

This will print the third elements of each tuple in the list of lists. Adjust the example according to your specific needs.

Examples

  1. How to recursively iterate through a list of lists of 3-tuples in Haskell?

    • Description: This query seeks information on how to recursively traverse and process elements of a list of lists of 3-tuples in Haskell.
    -- Example Haskell code to recursively iterate through a list of lists of 3-tuples iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough [] = [] iterateThrough (x:xs) = processTupleList x ++ iterateThrough xs processTupleList :: [(a, a, a)] -> [a] processTupleList [] = [] processTupleList ((a, b, c):ts) = a : b : c : processTupleList ts

  2. Haskell recursion over a list of lists of 3-tuples?

    • Description: This query focuses on implementing recursive functions to handle a list of lists of 3-tuples in Haskell.
    -- Example Haskell code for recursion over a list of lists of 3-tuples iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough = concatMap (\(x, y, z) -> [x, y, z]) . concat

  3. How to traverse and process elements of a list of lists of 3-tuples recursively in Haskell?

    • Description: This query seeks information on recursively traversing and processing elements of a list of lists of 3-tuples in Haskell.
    -- Example Haskell code to traverse and process elements of a list of lists of 3-tuples recursively iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough [] = [] iterateThrough ([]:xs) = iterateThrough xs iterateThrough ((x:xs):ys) = processTuple x ++ iterateThrough (xs:ys) processTuple :: (a, a, a) -> [a] processTuple (a, b, c) = [a, b, c]

  4. Haskell recursive function for iterating over a list of lists of 3-tuples?

    • Description: This query focuses on implementing a recursive function in Haskell to iterate over a list of lists of 3-tuples.
    -- Example Haskell code for a recursive function to iterate over a list of lists of 3-tuples iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough [] = [] iterateThrough (x:xs) = concatMap (\(a, b, c) -> [a, b, c]) x ++ iterateThrough xs

  5. How to process elements of a list of lists of 3-tuples recursively in Haskell?

    • Description: This query seeks information on recursively processing elements of a list of lists of 3-tuples in Haskell.
    -- Example Haskell code to process elements of a list of lists of 3-tuples recursively process :: [[(a, a, a)]] -> [a] process [] = [] process (x:xs) = concatMap (\(a, b, c) -> [a, b, c]) x ++ process xs

  6. Haskell recursion over nested lists of 3-tuples?

    • Description: This query focuses on implementing recursion to handle nested lists of 3-tuples in Haskell.
    -- Example Haskell code for recursion over nested lists of 3-tuples iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough = concatMap (\(a, b, c) -> [a, b, c]) . concat

  7. How to traverse a list of lists of 3-tuples recursively in Haskell?

    • Description: This query seeks information on how to recursively traverse a list of lists of 3-tuples in Haskell.
    -- Example Haskell code to recursively traverse a list of lists of 3-tuples traverseList :: [[(a, a, a)]] -> [a] traverseList [] = [] traverseList (x:xs) = processTupleList x ++ traverseList xs processTupleList :: [(a, a, a)] -> [a] processTupleList [] = [] processTupleList ((a, b, c):ts) = a : b : c : processTupleList ts

  8. Haskell recursive function for processing a list of lists of 3-tuples?

    • Description: This query focuses on implementing a recursive function in Haskell to process a list of lists of 3-tuples.
    -- Example Haskell code for a recursive function to process a list of lists of 3-tuples process :: [[(a, a, a)]] -> [a] process [] = [] process (x:xs) = concatMap (\(a, b, c) -> [a, b, c]) x ++ process xs

  9. How to recursively flatten a list of lists of 3-tuples in Haskell?

    • Description: This query seeks information on recursively flattening a list of lists of 3-tuples in Haskell.
    -- Example Haskell code to recursively flatten a list of lists of 3-tuples flatten :: [[(a, a, a)]] -> [a] flatten = concatMap (\(x, y, z) -> [x, y, z]) . concat

  10. Haskell recursion over a nested list of 3-tuples?

    • Description: This query focuses on implementing recursion to handle a nested list of 3-tuples in Haskell.
    -- Example Haskell code for recursion over a nested list of 3-tuples iterateThrough :: [[(a, a, a)]] -> [a] iterateThrough = concatMap (\(x, y, z) -> [x, y, z]) . concat

More Tags

tomcat http class-library java-8 windows-8.1 greasemonkey-4 assemblyinfo windows-8 user-controls uidatepicker

More Programming Questions

More Financial Calculators

More Everyday Utility Calculators

More Investment Calculators

More Entertainment Anecdotes Calculators