I agree. I haven't done Erlang since 2009, but reading through that book taught me a lot about functional programming theory, state mutation concepts, paralleli

I agree. I haven't done Erlang since 2009, but reading through that book taught me a lot about functional programming theory, state mutation concepts, parallelising code properly and many other things. Definitely not a book for beginners to programming but I think that an individual with at least one language under their belt will get a lot out of it. It's a very easy read considering the myriad topics covered.