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2 votes

is shuffle a Monad?

The haskell monad you mention models the process of drawing from a sequence at random. It is a state monad--with underlying map of objects $X \mapsto (S\times X)^S$--where the state includes the remai …
Wouter Stekelenburg's user avatar
7 votes
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What is the (Co)Monad for a Bag

Even Haskell requires some squinting if you want its structures to look like true monads (see: http://math.andrej.com/2016/08/06/hask-is-not-a-category/). … On top of that, popular data structures that consist of key-value pairs with unique keys (they go by different names in different languages) aren't monads. Comonads have co-units. …
Wouter Stekelenburg's user avatar