In this presentation, Alejandro is going to talk about one of the many kinds of composition available in Haskell, namely "functor composition": for any two functors we can create a new one. Some functors, such as applicatives and monads, have additional structure. Interestingly, applicatives can be composed to get a new applicative, but the same does not happen for monads. This has important implications: since monads do not compose, we need something else.

Join us for a stimulating evening discussion with a true scholar of functional programming. This talk will be especially appropriate for beginners to Haskell who would like a better understanding of one of its fundamental concepts: composition.

Alejandro is a senior software engineer at 47 Degrees, devoting his time to training and open source around Haskell. Before that, he held several positions at Utrecht University, from which he obtained a Ph.D. on a topic related to compiling functional languages. He has wide experience, as a speaker and lecturer, in introducing functional concepts and is the author of the books, "Practical Haskell" and "The Book of Monads".

This Meetup will be recorded and posted to YouTube. Please note that you will need to log in to Zoom with an account in order to participate and that attendance is first come, first served, limited to 100 people.

Steven Syrek

Berlin Functional Programming Group

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Alejandro Serrano Mena on Why Functors and Applicatives Compose but Monads Don't

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Berlin Functional Programming Group

Alejandro Serrano Mena on Why Functors and Applicatives Compose but Monads Don't

Berlin Functional Programming Group

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