README.md

scala-with-cats

scala with cats 一书的笔记、习题

• Chapter 1 Introduction
  • 1.1 Anatomy of a Type Class
  • 1.2 Working with Implicits
  • 1.3 Exercise: Printable Library
  • 1.4 Meet Cats
  • 1.5 Example: Eq
  • 1.6 Controlling Instance Selection
  • 1.7 Summary
• Chapter 2 Monoids and Semigroups
  • 2.1 Definition of a Monoid
  • 2.2 Definition of a Semigroup
  • 2.3 Exercise: The Truth About Monoids
  • 2.4 Exercise: All Set for Monoids
  • 2.5 Monoids in Cats
  • 2.6 Applications of Monoids
  • 2.7 Summary
• Chapter 3 Functors
  • 3.1 Examples of Functors
  • 3.2 More Examples of Functors
  • 3.3 Definition of a Functor
  • 3.4 Aside: Higher Kinds and Type Constructors
  • 3.5 Functors in Cats
• Chapter 4 Monads
  • 4.1 What is a Monad?
  • 4.2 Monad in Cats
  • 4.3 The Identity Monad
  • 4.4 Either
  • 4.5 Aside: Error Handling and MonadError
  • 4.6 The Eval Monad
  • 4.7 The Writer Monad
  • 4.8 The Reader Monad
  • 4.9 The State Monad
  • 4.10 Defining Custom Monads
  • 4.11 Summary
• Chapter 5 Monad Transformers
  • 5.1 Exercise: Composing Monads
  • 5.2 A Transformative Example
  • 5.3 Monad Transformers in Cats
  • 5.4 Exercise: Monads: Transform and Roll Out
  • 5.5 Summary
• Chapter 6 Semigroupal and Applicative
  • 6.1 Semigroupal
  • 6.2 Apply Syntax
  • 6.3 Semigroupal Applied to Different Types
  • 6.4 Validated
  • 6.5 Apply and Applicative
  • 6.6 Summary
• Chapter 7 Foldable and Traverse
  • 7.1 Foldable
  • 7.2 Traverse
  • 7.3 Summary
• Chapter 8 Case Study: Testing Asynchronous Code
  • 8.1 Abstracting over Type Constructors
  • 8.2 Abstracting over Monads
  • 8.3 Summary
• Chapter 9 Case Study: Map-Reduce
  • 9.1 Parallelizing map and fold
  • 9.2 Implementing foldMap
  • 9.3 Parallelising foldMap
  • 9.4 Summary
• Chapter 10 Case Study: Data Validation
  • 10.1 Sketching the Library Structure
  • 10.2 The Check Datatype
  • 10.3 Basic Combinators
  • 10.4 Transforming Data
  • 10.5 Kleislis
  • 10.6 Summary
• Chapter 11 Case Study: CRDTs
  • 11.1 Eventual Consistency
  • 11.2 The GCounter
  • 11.3 Generalisation
  • 11.4 Abstracting GCounter to a Type Class
  • 11.5 Abstracting a Key Value Store
  • 11.6 Summary