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The book's content is 5/5. The print, however, not so good. The cover fell off in just one week. The first time this has ever happened to me. All the book's content is open-source and you can take a look at it online on rust's official website.
I'm very satisfied with the book. unfortunately after two weeks the cover fell off... so I had to take a star away for that; very odd first book I've ever had that did that... i think I'll avoid no starch press in the future