Functional Programming for Mortals
Functional Programming for Mortals (The Digital Book)
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Functional Programming for Mortals

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Completed on 2019-07-19

About the Book

This book is for the typical Scala developer, probably with a Java background, who is both sceptical and curious about the Functional Programming (FP) paradigm. This book justifies every concept with practical examples, including writing a web application.

Frequently Asked Questions

Q: How does it compare to the red book?

A: This book is blue.

Q: Where can I buy a physical copy?

A: Hardback books are available at Lulu (and budget Paperbacks too).

Q: Is this suitable for beginners?

A: No, this is an intermediate book. First read Programming in Scala or Essential Scala.

Q: I know Haskell, is this book for me?

A: You're not really the target audience. Also, I am so sorry.

Q: Why is the cover so ugly?

A: Because I love Geometrical Methods of Mathematical Physics.

About the Author

Sam Halliday
Sam Halliday

Chartered Mathematician, Haskell and Emacs hacker, Free Software / education zealot. Read an interview with Sam by Leanpub.

Table of Contents

  • About This Book
  • Copyleft Notice
  • Thanks
  • Practicalities
  • 1. Introduction
    • 1.1 Abstracting over Execution
    • 1.2 Pure Functional Programming
  • 2. For Comprehensions
    • 2.1 Syntax Sugar
    • 2.2 Unhappy path
    • 2.3 Gymnastics
    • 2.4 Incomprehensible
  • 3. Application Design
    • 3.1 Specification
    • 3.2 Interfaces / Algebras
    • 3.3 Business Logic
    • 3.4 Unit Tests
    • 3.5 Parallel
    • 3.6 Summary
  • 4. Data and Functionality
    • 4.1 Data
    • 4.2 Functionality
    • 4.3 Modelling OAuth2
    • 4.4 Summary
  • 5. Scalaz Typeclasses
    • 5.1 Agenda
    • 5.2 Appendable Things
    • 5.3 Objecty Things
    • 5.4 Mappable Things
    • 5.5 Variance
    • 5.6 Apply and Bind
    • 5.7 Applicative and Monad
    • 5.8 Divide and Conquer
    • 5.9 Plus
    • 5.10 Lone Wolves
    • 5.11 Co-things
    • 5.12 Bi-things
    • 5.13 Summary
  • 6. Scalaz Data Types
    • 6.1 Type Variance
    • 6.2 Evaluation
    • 6.3 Memoisation
    • 6.4 Tagging
    • 6.5 Natural Transformations
    • 6.6 Isomorphism
    • 6.7 Containers
    • 6.8 Collections
    • 6.9 Summary
  • 7. Advanced Monads
    • 7.1 Always in motion is the Future
    • 7.2 Effects and Side Effects
    • 7.3 Stack Safety
    • 7.4 Monad Transformer Library
    • 7.5 A Free Lunch
    • 7.6 Parallel
    • 7.7 IO
    • 7.8 Summary
  • 8. Typeclass Derivation
    • 8.1 Running Examples
    • 8.2 scalaz-deriving
    • 8.3 Magnolia
    • 8.4 Shapeless
    • 8.5 Performance
    • 8.6 Summary
  • 9. Wiring up the Application
    • 9.1 Overview
    • 9.2 Main
    • 9.3 Blaze
    • 9.4 Thank You
  • Typeclass Cheatsheet
  • Haskell
    • Data
    • Functions
    • Typeclasses
    • Records of Functions
    • Modules
    • Evaluation
    • Next Steps
  • Third Party Licenses
    • Scala License
    • Scalaz License

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We envision a world that honors and values cultural and biological diversity and the critical contribution of tropical rainforests to our planet's life support system. We believe that indigenous self-determination is paramount, and see that indigenous knowledge, cultures and traditional practices contribute greatly to sustainable and equitable stewardship of the Earth. We strive for a world in which governments, corporations and civil society respect the collective rights of indigenous peoples to free, prior and informed consent over any activity affecting their territories and resources. We commit, in the spirit of partnership and mutual respect, to support our indigenous allies in their efforts to protect life, land, and culture in accordance with their aspirations and needs.

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