List of Listings

Chapter 1. What is functional programming?

Listing 1.1. A Scala program with side effects

Listing 1.2. Adding a payments object

Listing 1.3. Buying multiple cups with buyCoffees

Chapter 2. Getting started with functional programming in Scala

Listing 2.1. A simple Scala program

Listing 2.2. A simple program including the factorial function

Listing 2.3. Monomorphic function to find a String in an array

Listing 2.4. Polymorphic function to find an element in an array

Chapter 3. Functional data structures

Listing 3.1. Singly linked lists

Listing 3.2. Right folds and simple uses

Chapter 4. Handling errors without exceptions

Listing 4.1. Throwing and catching an exception

Listing 4.2. The Option data type

Listing 4.3. Using Option

Listing 4.4. Using Either to validate data

Chapter 5. Strictness and laziness

Listing 5.1. Program trace for List

Listing 5.2. Simple definition for Stream

Listing 5.3. Program trace for Stream

Chapter 6. Purely functional state

Listing 6.1. Using scala.util.Random to generate random numbers

Listing 6.2. A purely functional random number generator

Chapter 7. Purely functional parallelism

Listing 7.1. Summing a list using a divide-and-conquer algorithm

Listing 7.2. Updating sum with our custom data type

Listing 7.3. Program trace for sum

Listing 7.4. Basic sketch for an API for Par

Listing 7.5. Basic implementation for Par

Listing 7.6. Implementing run for Par

Listing 7.7. Implementing map2 with Actor

Chapter 8. Property-based testing

Listing 8.1. ScalaCheck properties