Practical Vavr
Practical Vavr
About the Book
Practical Vavr is all about making you want to use Vavr in your day to day Java programming.
If you want to improve the quality of your code by using a well-thought and beautifully designed functional programming library for Java, then you need to adopt Vavr, and this book will help you put it in practice.
Table of Contents
-
Practical Vavr
-
Vavr
- Why
- How
-
This book
- Why
- Code samples
- About me
- The cover
- Thank you
-
Tuple
- Creating Tuples
- Creating Tuples from Iterables
- Accessing elements
- Mapping a tuple
- Updating a Tuple
- Transforming Tuples
- Getting the size
- Growing Tuples
- Converting to a sequence
- Hashing objects
- Tuples and Maps
-
Option
- Creating an Option
- Conditionally creating an Option
- Creating an Option from a sequence
- Checking the status of an Option
-
Creating an Option holding
null
- Running side effects
- Getting the value out of an Option
- Filtering an Option
- Mapping an Option
- Mapping and nulls or other Option
- Transforming an Option
- Using with collectors
-
Either
- Creating an Either
- Creating an Either from a sequence
- Checking the status of an Either
- Running side effects
- Getting the value out of an Either
- Filtering an Either
- Swaping an Either
- Mapping an Either (transforming what’s inside)
- Using with collectors
-
Try
- Creating a Try
- Using a Try to run a procedure
- Checking the status of a Try
- Running side effects
- Chaining side effects
- Finally
- Getting the value out of a Try
- Filtering a Try
- Making an Either
- Making a Validation
- Mapping a Try
- Mapping and null
- Making a Success from a Failure
- Recovering from errors
- Working with resources
- Using with collectors
-
Lazy
- Creating a Lazy
- Getting the value
- Knowing if a Lazy has been evaluated
- Filtering a Lazy
- Mapping on a Lazy
- Running a side effect
- Transforming to another domain
- Deprecation
-
Future
- Creating a Future
- Retrieve a Future state
- Retrieving a Future’s value
- Running side effects
- Canceling a Future
- Awaiting termination
- Finding a Future within a sequence
- Finding the first completed Future within a sequence
- Running tasks
-
Accessing the underlying
Executor
-
Providing a custom
Executor
- Mapping the Future
- Folding futures
- Reducing Futures
- Filtering Futures
- Zipping Futures
- Recovering from errors
- Try Interrop
- Java Interrop
- Using with collectors
-
Match
- Creating a Match
- Adding cases
- Patterns
- Predicates
-
Validation
- Creating a validation
- Combining and applying validations
- Retrieve the status of a Validation
- Swapping a Validation
- Running a side effect
- Folding a Validation
- Mapping a Validation
-
Functions
- Creating functions
- Constants
- Composition
- Lifting
- Partial application
- Currying
- Memoization
- Reversing parameters
- Getting the arity
- Using Tuples as parameters
- Sneaky Throws
- Recovering
-
Collections
- Performance characteristics of Vavr Collections
- Vavr collections regarding Java collections
- Hierarchy
-
Sequences
- Creating a sequence
- Appending to a sequence
- Updating an element
- Removing and filtering elements
- Finding elements
- Slices and sub sequences
- Head and tail
- Dropping elements
- Inserting between elements
- Padding
- Taking elements
- Checking if starting or ending
- Folding and reducing sequences
- Partitioning sequences
- Patching sequences
- Replacing an element
- Splitting sequences
- Sorting sequences
- Shuffling sequences
- Sliding over sequences
- Scanning sequences
- Rotating sequences
- Reversing sequences
- Generating permutations
- Generating combinations
- Grouping elements
- Keeping distinct elements
- Generating cross products
- Zipping sequences
- Finding longest segments
- Summing elements
- Product of elements
- Minimum and maximum
- Averaging elements
- Flattening sequences
- Making Strings
- Java Interop
- Using with collectors
-
Sets
- Creating a Set
- Creating ranges
- Appending to a Set
- Updating an element
- Removing and filtering elements
- Finding elements
- Head and tail
- Getting the size
- Dropping elements
- Taking elements
- Sorting sets
- Partitioning sets
- Sliding sets
- Scanning sets
- Grouping elements
- Union of sets
- Intersection of sets
- Difference of sets
- Keeping distinct elements
- Zipping sets
- Summing elements
- Product of elements
- Minimum and maximum
- Averaging elements
- Making Strings
- Interop with Java
- Using with collectors
-
Maps
- Creating a Map
- Adding entries to a Map
- Updating an entry
- Removing and filtering elements
- Finding elements
- Head and tail
- Getting the size
- Retrieving the keys
- Retrieving the values
- Dropping elements
- Taking elements
- Sorting Map
- Mapping Maps
- Sliding over Maps
- Scanning entries
- Grouping elements
- Merging two Maps
- Reversing entries
- Keeping distinct entries
-
Folding and reducing Maps
- Zipping entries
- Partitioning Maps
- Interop with Java
- Using with collectors
-
Streams
- Creating a sequence
- Appending to a Stream
- Updating an element
- Removing and filtering elements
- Finding elements
- Slices and sub sequences
- Head and tail
- Dropping elements
- Taking elements
- Checking if starting or ending
- Splitting streams
- Sorting streams
- Sliding over streams
- Scanning streams
- Rotating streams
- Reversing streams
- Generating permutations
- Generating combinations
- Keeping distinct elements
- Generating cross products
- Zipping streams
-
Vavr in action
- Try: a real world example
- The Gilded Rose Kata
- From HTTP to the Database, and back
- Analysing football data
- Advent Of Code
-
Vavr and Kotlin
- Usage
- Tuple
- Option
- Either
- Try
- List
- Set
- Map
-
Vavr and Property Testing
- Usage
- FizzBuzz
- API
-
Vavr
Authors have earned$9,883,643writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
C++ Best Practices
Jason TurnerLevel up your C++, get the tools working for you, eliminate common problems, and move on to more exciting things!
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
Functional Design and Architecture
Alexander GraninSoftware Design in Functional Programming, Design Patterns and Practices, Methodologies and Application Architectures. How to build real software in Haskell with less efforts and low risks. The first complete source of knowledge.
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
C++20
Rainer GrimmC++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.
I am a Software Engineer and I am in Charge
Alexis Monville and Michael DoyleI am a Software Engineer and I am in Charge is a real-world, practical book that helps you increase your impact and satisfaction at work no matter who you work with.
In the book, we will follow Sandrine, a fictional character who learns to think in a new way enabling her to take a different course of action.
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
Invest In Digital Health - The Medical Futurist's Guide
Dr. Bertalan MeskoArtificial Intelligence and Digital Health are booming. In this book, we explain why now it's a good time to invest in Digital Health and give recommendations on where to invest by looking at the top 24 technological trends we find the most promising.
The Hundred-Page Machine Learning Book
Andriy BurkovEverything you really need to know in Machine Learning in a hundred pages.
Mastering STM32
Carmine NovielloWith more than 600 microcontrollers, STM32 is probably the most complete ARM Cortex-M platform on the market. This book aims to be the first guide around that introduces the reader to this exciting MCU portfolio from ST Microelectronics and its official CubeHAL.
Top Bundles
- #1
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #2
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #3
The Future of Digital Health
6 Books
We put together the most popular books from The Medical Futurist to provide a clear picture about the major trends shaping the future of medicine and healthcare. Digital health technologies, artificial intelligence, the future of 20 medical specialties, big pharma, data privacy and how technology giants such as Amazon or Google want to conquer... - #4
Cisco CCNA 200-301 Complet
4 Books
Ce lot comprend les quatre volumes du guide préparation à l'examen de certification Cisco CCNA 200-301. - #5
CCDE Practical Studies (All labs)
3 Books
CCDE lab - #6
"The C++ Standard Library" and "Concurrency with Modern C++"
2 Books
Get my books "The C++ Standard Library" and "Concurrency with Modern C++" in a bundle. The first book gives you the details you should know about the C++ standard library; the second one dives deeper into concurrency with modern C++. In sum, you get more than 600 pages full of modern C++ and about 250 source files presenting the standard library... - #7
Modern Management Made Easy
3 Books
Read all three Modern Management Made Easy books. Learn to manage yourself, lead and serve others, and lead the organization. - #8
Linux Administration Complet
4 Books
Ce lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité... - #9
Programming with Ease
3 Books
Alle drei Bände der Serie Programming with Ease in einem Paket. Darin findest du alles, was ich dir zu den wichtigsten Phasen der Softwareentwicklung im Hinblick auf Clean Code Development für langfristig hohe Produktivität sagen kann.Im Band Slicing findest du die Anforderungsanalyse im Rahmen eines iterativ-inkrementellen Vorgehensmodells aus... - #10
Vagrant Ansible
2 Books
Unveil the power of Ansible and Vagrant with this bundle at a special price. You'll have everything you need to get started with Vagrant - learn the basics and how to create your virtual development environments, using Ansible as provisioner! About Vagrant Cookbook Vagrant Cookbook is a complete guide to get started with Vagrant and create your...