I work with Andy, the author. I watched the Haskell push from the sidelines and did not learn it until well after it had already gained momentum. My intend be

I work with Andy, the author. I watched the Haskell push from the sidelines and did not learn it until well after it had already gained momentum. My intend behind not learning the language was to retain empathy with people who hadn't yet gone through the spin-up. When I finally got around to learning Haskell, I found myself able to productively make small changes within a few days. A lot of the more... idiomatic? uses of Functor and Applicative took another week or so to learn. The books Learn You a Haskell and Real World Haskell were helpful there. I am by no means an expert at Haskell now, but within a few weeks I was able to contribute to most areas of the stack.