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Functional Programming, Simplified (Scala edition)
Changelog
Introductory Matter
Functional Programming Background (Section)
Scala and Functional Programming (Section)
Scala Recursion Lessons (Section)
A First Look at “State” in Functional Programming
A Functional Game (With a Little Bit of State)
A Quick Review of Scala’s Case Classes
Scala/FP Idiom: Update as You Copy, Don’t Mutate
A Quick Review of Scala’s for-expressions (for-comprehensions)
How to Write a Scala Class That Can Be Used in a `for` Expression (monads)
How to Create a Scala Sequence Class to be Used in a ‘for’ Expression
How to Make Sequence Work in a Simple Scala `for` Loop
How to Make Sequence Work as a Single Generator in a `for` Expression
How to Enable Filtering in a Scala for-expression
How to Enable the Use of Multiple Generators in a Scala for-expression
Lessons that didn’t fit in the printed book
What is “Functional Programming”?
What is This “Lambda” You Speak Of?
Benefits of Functional Programming
Disadvantages of Functional Programming
The “Great FP Terminology Barrier”
The Definition of “Pure Function”
Functions Are Variables, Too
Grandma’s Cookies and Pure Functions
The Benefits of Pure Functions
Using Scala Methods As If They Were Functions (Eta Expansion)
Pure Functions and I/O
How to Write Scala Functions That Take Functions as Input Parameters
Functional Programming, Simplified (Introduction)
Recursion: Introduction
How to Write a ‘map’ Function in Scala
Scala/FP: Pure Function Signatures Tell All (They don’t lie)
Who This Book is For
Recursion: Motivation
Recursion: Let’s Look at Lists
How to Use By-Name Parameters in Scala
Functional Programming is Like Algebra
Goals, Part 1: “Soft” Goals of This Book
Recursion: How to Write a ‘sum’ Function in Scala
A Note About Expression-Oriented Programming
How to Write and Use Scala Functions That Have Multiple Parameter Groups
Goals, Part 2: Concrete Goals of This Book
Functional Programming is Like Unix Pipelines
Goals, Part 3: A Disclaimer
Recursion: How Recursive Scala Function Calls Work
Partially-Applied Functions (and Currying) in Scala
Recursion: Visualizing the recursive `sum` Function
Question Everything
Rules for Programming in This Book
Recursion: A Conversation Between Two Developers
Recursion: Thinking Recursively
JVM Stacks and Stack Frames
A Visual Look at JVM Stacks and Frames
Writing Tail-Recursive Algorithms in Scala (and the tailrec annotation)
Introduction to ScalaCheck, Part 1
Introduction to ScalaCheck, Part 2 (A more complicated example)
Signpost: Type Classes
Scala 2 Type Classes 101: Introduction
Scala Type Classes 102: The Pizza Class
Type Classes 103: The Cats Library
Scala: The Differences Between `val` and `def` When Creating Functions
Appendix: Scala `for` expression translation examples
On Using `def` vs `val` To Define Abstract Members in Scala Traits
Appendix: Recursion is great, but check out Scala’s fold and reduce!
Appendix: Algebraic Data Types in Scala

Scala Recursion Lessons (Section)

This section contains lessons on recursion (recursive programming) in Scala. The lessons in this section are listed below.

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Next: A First Look at “State” in Functional Programming >

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