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If you want to look at an interesting functional language that has some very solid real world uses, have a look at Erlang, and its own "Learn you ..." here:


Which is a fantastic book, clearly written as a labor of love.

Erlang doesn't have Haskell's type system and doesn't seem to be of much interest for CS research types, but it's awesome for developing certain kinds of system.

I am curious about Haskell myself, and don't tend to need a lot of excuses to learn a language, but I don't perceive a "sweet spot" for it just yet, as in "I could go build X, and Haskell would be a great fit for it". Given how many smart people use it, I'm sure there are a lot of applications for it, but I also get a feeling that there's not one thing that really stands out.

One thing that I love to do in Haskell, and which Haskell is especially suited to, is writing interpreters and parsers. The other week I wrote a brainfuck interpreter (https://github.com/imeckler/skellfuck) in a couple of hours. Parsec, along with monads and functors, make this kind of thing a real joy to write.

That still seems like something of a second order problem in that you're solving your own problem that you might need in order to solve a customer's problem.

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