For a long time, the world of Erlang programming had only one book—The Book,[1] released in 1993 and revised in 1996. Fanatics can still find it in print, at a price of over $100. A decade or so after its publication, The Book was getting long in the tooth, to say the least. The language had evolved to include several new and powerful programming constructs. Higher-order functions, list comprehensions, and the bit syntax are found everywhere in modern Erlang programs but weren’t described in The Book. But the most notable omission was the Open Telecom Platform (OTP), Erlang’s application development framework, which was first released in 1996. Erlang was rather easy to learn; OTP wasn’t, and early adopters like Martin Logan, who started ...

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