January 12, 2021

Essential Effects: early access release and more!

Greetings everyone -

Tomorrow will be a big day: I'll be releasing the early-access edition of "Essential Effects"! (I've included the current table of contents to give you an idea of what the book covers.) Early-access will cost $35, with free updates when the final version is published. Check out the main site tomorrow for the link.

I'm also giving a talk tomorrow about effects for the SF Scala user group, anyone can attend!

Finally, there are still tickets available for the upcoming 3-day "Essential Effects" course, January 27-29th. You can learn more at the course site.

.. Adam

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Table of Contents

• Preface
  • Acknowledgements
  • About this book
  • Cats Effect versions
  • Source code for examples and exercises
  • Prerequisites
• Chapter 1. Effects: evaluation and execution
  • The substitution model of evaluation
  • Dealing with side-effects
  • The Effect Pattern
  • Capturing arbitrary side-effects as an effect
  • Composing effects
  • Summary
• Chapter 2. Cats Effect IO
  • Constructing IO values
  • Transforming IO values
  • Executing IO values
  • IO as an effect
  • Executing effects in applications with IOApp
  • Summary
• Chapter 3. Parallel execution
  • Does IO support parallelism?
  • The Parallel typeclass
  • Inspecting parallelism
  • parMapN
  • parTraverse
  • parSequence
  • Summary
• Chapter 4. Concurrent control
  • Decomposing the behavior of parMapN
  • Gaining control with Fiber
  • Canceling a running Fiber
  • Racing multiple effects
  • Summary
• Chapter 5. Shifting contexts
  • How much parallelism can we get?
  • The need for multiple contexts
  • Contexts for I/O-bound actions
  • How do you know something is blocking?
  • Finer-grained control of contexts
  • Example: contexts for database access in Doobie
  • Summary
• Chapter 6. Integrating asynchrony
  • Asynchronous callbacks
  • Integrating with Future
  • Summary
• Chapter 7. Managing resources
  • Creating a Resource to manage state
  • Composing managed state
  • Resources for dependency management
  • Summary
• Chapter 8. Testing Effects
  • Assertions on effectful values
  • Testing effect scheduling by controlling its dependencies
  • Summary
• Chapter 9. Concurrent coordination
  • Atomic updates with Ref
  • Write-once synchronization with Deferred
  • Concurrent state machines
  • Summary
• Chapter 10. Case study: job scheduler
• Chapter 11. Conclusion
• Glossary
• Appendix A: Cheatsheets
• Appendix B: Abstracting effects with typeclasses
• Appendix C: Changes in Cats Effect 3
• Appendix D: Solutions to selected exercises
• References