List of Listings

Chapter 1. What is functional programming?

Listing 1.1. A Java program with side effects

Listing 1.2. The Payment class

Listing 1.3. The Tuple class

Listing 1.4. Composing multiple payments into a single one

Listing 1.5. Buying multiple donuts at once

Listing 1.6. Grouping payments by credit card

Chapter 2. Using functions in Java

Listing 2.1. Functional methods

Listing 2.2. functional programminginterfacesinterfacesas functionsJavafunctional interfacesJavaJavaThe complete Function interface

Listing 2.3. A one-liner lambda-based method converted to previous Java versions

Chapter 3. Making Java more functional

Listing 3.1. Simple email validation

Listing 3.2. Using a function to validate the email

Listing 3.3. A component to manage the result of a computation

Listing 3.4. The program with better error handling

Listing 3.5. Returning executables

Listing 3.6. A Result that can handle Effects

Listing 3.7. A cleaner version of the program

Listing 3.8. Matching conditions with the Case class

Listing 3.9. The email validation application with no control structures

Listing 3.10. The component representing one line of an order

Listing 3.11. Handling orders

Chapter 4. Recursion, corecursion, and memoization

Listing 4.1. The TailCall interface and its two implementations

Listing 4.2. The modified recursive method

Listing 4.3. The complete TailCall class

Listing 4.4. A standalone tail recursive function

Listing 4.5. Recursive Fibonacci with implicit memoization

Listing 4.6. The Memoizer class