Finding Success (and Failure) in Haskell Fall in love with applicative functors

Finding Success (and Failure) in Haskell: Fall in love with applicative functors
English | 2019 | ISBN: n/a | 206 Pages | PDF EPUB MOBI | 9 MB
Julie originally planned this course and taught a version of it at the Austin Haskell Meetup. The group had, by then, learned about monads and applicatives and how typeclasses work and all that good stuff, but it wasn't yet clear and concrete to them. It's one thing to talk about an idea and another to make use of it, so this series of lessons was planned to understand some things about monads and applicatives by using them. We started with a basic problem to solve - validating some user inputs - wrote a few basic functions and, over the course of a few hours, refactored it to use different types. Some of those types are monads, and some are not, and we were able to reach a concrete understanding of why and why not.