With this being our fourth edition, we find ourselves used to saying this. It always needs to be said, though: Books are not created by authors alone. They are shepherded into existence by a community of collaborators, risk-takers, and other supporters, without whom the burden of comprehending and writing all this material would be overwhelming.

  • Brian Hardy, who, along with Bill Phillips, had the gusto to bring the very first edition of this book into the world.

  • Eric Maxwell, for single-handedly writing the For the More Curious section on dependency injection, for improving our coverage of notification channels, and for addressing numerous editor remarks that touched so many pages of this book.

  • David Greenhalgh ...

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