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Clojure Reactive Programming by Leonardo Borges

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Monads

Our last abstraction will solve the very problem we raised in the previous section: how to safely perform intermediate calculations by preserving the semantics of the abstractions we're working with—in this case, options.

It should be no surprise now that fluokitten also provides a protocol for Monads, simplified and shown as follows:

(defprotocol Monad
  (bind [mv g]))

If you think in terms of a class hierarchy, Monads would be at the bottom of it, inheriting from Applicative Functors, which, in turn, inherit from Functors. That is, if you're working with a Monad, you can assume it is also an Applicative and a Functor.

The bind function of monads takes a function g as its second argument. This function receives as input the value contained in ...

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