About

This project is my studying notes that I wrote while learning functional programming in Java.

Notes

My notes about Java 8 new classes here. List of notes:

• Optional (RU)

Stepik.org course "Java. Functional programming"

Answers for hard exercises of the course are here.
Grouped by theory lessons:

• 1.2 Lambda expressions and method references;
• 1.3 Functions are objects;
• 1.4 Introduction to streams;
• 1.5 Learn more about map, reduce and forEach;
• 1.6 Collectors;
• 1.7 Parallel streams;
• 1.8 Returning functions and currying;
• 1.9 Monads and related things in Java 8.

Book "Richard Warburton - Java 8 Lambdas"

Exercise answers from the book are here.
Grouped by chapters:

• Chapter 2. Lambdas;
• Chapter 3. Streams;
• Chapter 4. Libraries;
• Chapter 5. Collections and Collectors;
• Chapter 6. Data parallelism.

Chapters 1, 7-10 have no exercises.

Test for Java 8 API

Also there is tests for new Java 8 classes. List of tests:

• Optional
• Predicate
• Function

Custom functional API

Some standard java functional API improvements:

• ImprovedBooleanSupplier - standard BooleanSupplier with added logical functions (OR, AND, NEGATE).

Additional info

Here is a list of additional materials to learn about Functional Programming in Java.

Courses

• Stepik.org - Java. Functional programming

Books

• Richard Warburton - Java 8 Lambdas. Functional programming for the masses: En, Ru. GitHub
• Pierre-Yves Saumont - Functional programming in Java: En

Videos

English:

• null

Russian:

• Тагир Валеев - Stream API: рекомендации лучших собаководов (2016). YouTube
• Тагир Валеев - Странности Stream API (2016). YouTube
• Тагир Валеев - Причуды Stream API (2016). YouTube
• Сергей Куксенко - Stream API, часть 1. YouTube
• Сергей Куксенко - Stream API, часть 2. YouTube
• Андрей Родионов - От Java Threads к лямбдам (2014). Youtube

Links

English:

• Java 8 tutorial. HowToDoInJava
• Java 8 Optional use-cases. DZone
• What's wrong in Java 8, Part I: Currying vs Closures. DZone. Перевод
• What's wrong in Java 8, Part II: Functions & Primitives. DZone. Перевод
• What's wrong in Java 8, Part III: Streams and Parallel Streams. DZone. Перевод
• What's wrong in Java 8, Part IV: Monads. DZone. Перевод
• What's wrong in Java 8, Part V: Tuples. DZone. Перевод
• What's wrong in Java 8, Part VI: Strictness. DZone. Перевод
• What's wrong in Java 8, Part VII: Streams again. DZone. Перевод

Also:

• Look at the full list of Pierre-Yves Saumont articles: DZone
• Look at the list of Tomasz Nurkiewicz articles (part of them is about Java 8): DZone

Russian:

• Полное руководство с анимированными операциями. Annimon
• Шпаргалка Java программиста. Java Stream API (2015). Хабр
• Stream API: универсальная промежуточная операция (2016). Хабр
• Используйте Stream API проще (или не используйте вообще) (2017) Хабр

Additional API

• Vavr - More functional programming features for Java
• StreamEx - additional useful methods for Java Stream API.

Technologies

Additional libraries used in this project:

• Lombok
• TestNG