This article is a re-publication of an article that I wrote some time ago for The Monad.Reader magazine, which is an online magazine about functional programming and Haskell. You can also read the article in the original PDF format as part of the Issue 18 (together with two other interesting articles). The samples from the article can be found on Github. Monad comprehensions have an interesting hi
Many parser combinator libraries in Haskell (such as parsec) have both a Monad interface as well as an Applicative interface. (Actually, to be really useful, you also need MonadPlus along with Monad, or Alternative along with Applicative, in order to encode choice; from now on when I talk about Monad and Applicative note that I really have MonadPlus or Alternative in mind as well.) The Applicative
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