What is the Comonad typeclass in Haskell?

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These links may be helpful:

  1. Evaluating cellular automata is comonadic. In particular, “whenever you see large datastructures pieced together from lots of small but similar computations there’s a good chance that we’re dealing with a comonad”.
  2. Sequences, streams, and segments
  3. Comonads in everyday life

More Related Contents:

  1. Confused by the meaning of the ‘Alternative’ type class and its relationship to other type classes
  2. Explicitly import instances
  3. Haskell types frustrating a simple ‘average’ function
  4. What’s the “|” for in a Haskell class definition?
  5. How to extract value from monadic action
  6. Typeclass constraints on data declarations
  7. Type Constraints in Data Declaration Haskell
  8. Zipper Comonads, Generically
  9. How does deriving work in Haskell?
  10. ‘some’ and ‘many’ functions from the ‘Alternative’ type class [duplicate]
  11. Return specific type within Haskell
  12. How to run a for loop in Haskell
  13. How is this fibonacci-function memoized?
  14. runST and function composition
  15. Explain this chunk of haskell code that outputs a stream of primes
  16. How to create a polyvariadic haskell function?
  17. foldl versus foldr behavior with infinite lists
  18. What is the purpose of Rank2Types?
  19. What are paramorphisms?
  20. Generating Fibonacci numbers in Haskell?
  21. In Haskell, when do we use in with let?
  22. How does foldr work?
  23. Is there a monad that doesn’t have a corresponding monad transformer (except IO)?
  24. What does “pure” mean in “pure functional language”?
  25. How to catch a no parse exception from the read function in Haskell?
  26. In what sense is the IO Monad pure?
  27. Is there a list of GHC extensions that are considered ‘safe’?
  28. Odd ghc error message, “My brain just exploded”?
  29. How Monads are considered pure?
  30. Explanation of “tying the knot”

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