"Two questions come up time and again: "when will the book be updated to Cats 2?", and "when will printed versions be available?" We're happy to say the answer to both is: soon! We have started working on updating the book. In fact the current version of the book, which is linked from the web site, is built against Cats 2 (although it does not discuss new concepts like the Parallel type class). This issue tracks our progress on the update."
"Our goals for the update are fairly modest, or, as I like to call them, achievable. We are definitely going to include discussion of Parallel, which is one of the main new additions in Cats 2 that completely changes how, for example, error handling is done. We might include some discussion of Cats Effects. I think Cats Effect is a very important library, but it's also a big library so I'm not sure we'll have time to write up exhaustive coverage."
Work has started updating Scala with Cats to Cats 2. The current version linked from the website is built against Cats 2 but does not discuss new concepts like the Parallel type class. The update will include discussion of Parallel, which changes error handling patterns. The update may include some coverage of Cats Effect, though exhaustive coverage is unlikely due to its size. Many small changes will accompany the update, with Parallel and possible Cats Effect coverage as the primary planned changes. Printed versions and finalized releases are expected soon. A mailing list is available from the Scala with Cats site to follow progress.
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