Haskell Tutorial and Cookbook
Haskell Tutorial and Cookbook
About the Book
Note: the second edition was released August 6, 2019. There is a free upgrade for readers who purchased the first edition. This book (and all of my Leanpub books) are also available for free on my web site https://markwatson.com/books/ if you would like them for free.
Functional programming is the paradigm that is replacing object oriented methodologies. The Haskell language has several advantages for functional programming: the language is mature, is supported by many libraries and development tools, and compiles to compact and efficient executable programs that can be "single file" deployed.
Haskell does have a steep learning curve in general but in this book I show you a small but effective subset of Haskell that will get you started quickly.
This book also provides something for more experienced Haskell developers: new ideas for Haskell applications and example code that is likely to be useful for your own projects.
The first section of this book contains two chapters:
- A tutorial on pure Haskell development: no side effects.
- A tutorial on impure Haskell development: dealing with the world (I/O, network access, database access, etc.)
After working through these tutorial chapters you will understand enough of Haskell development to understand and be able to modify for your own use the cookbook examples in the second section. Some of the general topics will be covered again in the second book section that contains longer sample applications. For example, you will learn the basics for interacting with Sqlite and Postgres databases in the tutorial on impure Haskell code but you will see a much longer example later in the book when I provide code for a Blackjack playing program.
The second section of this book contains the following recipes implemented as complete programs:
- Textprocessing CSV Files
- Textprocessing JSON Files
- Natural Language Processing (NLP) tools
- Client and Server network programming examples
- Access data on the Web using scraping and by querying Semantic Web RDF Data Sources
- Annotating English text with Wikipedia/DBPedia URIs for entities in the original text. Entities can be people, places, organizations, etc.
- Using sqlite and Postgres databases.
- Play a simple form of the Blackjack card game.
The third section (added for the second edition) contains:
- Automatic generation of Knowledge Graphs
- Hybrid Haskell + Python NLP examples
About the Author
Table of Contents
- Cover Material, Copyright, and License
-
Preface
- Additional Material in the Second Edition
- A Request from the Author
- Structure of the Book
- Code Examples
- Functional Programming Requires a Different Mind Set
- eBooks Are Living Documents
- Setting Up Your Development Environment
- Why Haskell?
- Enjoy Yourself
- Acknowledgements
- Section 1 - Tutorial
-
Tutorial on Pure Haskell Programming
- Interactive GHCi Shell
- Introduction to Haskell Types
- Functions Are Pure
- Using Parenthesis or the Special $ Character and Operator Precedence
- Lazy Evaluation
- Understanding List Comprehensions
- Haskell Rules for Indenting Code
- Understanding let and where
- Conditional do Expressions and Anonymous Functions
- Maps
- Sets
- More on Functions
- Comments on Dealing With Immutable Data and How to Structure Programs
- Error Handling
- Testing Haskell Code
- Pure Haskell Wrap Up
-
Tutorial on Impure Haskell Programming
- Hello IO () Monad
- A Note About >> and >>= Operators
- Console IO Example with Stack Configuration
- File IO
- Error Handling in Impure Code
- Network IO
- A Haskell Game Loop that Maintains State Functionally
- A More Detailed Look at Monads
- Using Applicative Operators <$> and <*>: Finding Common Words in Files
- List Comprehensions Using the do Notation
- Dealing With Time
- Using Debug.Trace
- Wrap Up
- Section 2 - Cookbook
-
Text Processing
- CSV Spreadsheet Files
- JSON Data
- Cleaning Natural Language Text
-
Natural Language Processing Tools
- Resolve Entities in Text to DBPedia URIs
- Bag of Words Classification Model
- Text Summarization
- Part of Speech Tagging
- Natural Language Processing Wrap Up
-
Linked Data and the Semantic Web
- The SPARQL Query Language
- A Haskell HTTP Based SPARQL Client
- Querying Remote SPARQL Endpoints
- Linked Data and Semantic Web Wrap Up
-
Web Scraping
- Using the Wreq Library
- Using the HandsomeSoup Library for Parsing HTML
- Web Scraping Wrap Up
-
Using Relational Databases
- Database Access for Sqlite
- Database Access for Postgres
- Haskell Program to Play the Blackjack Card Game
- Section 3 - Larger Projects
-
Knowledge Graph Creator
- Code Layout For the KGCreator Project and strategies for sharing Haskell code between projects
- The Main Event: Detecting Entities in Text
- Utility Code for Generating RDF
- Utility Code for Generating Cypher Input Data for Neo4J
- Top Level API Code for Handling Knowledge Graph Data Generation
- Wrapup for Automating the Creation of Knowledge Graphs
-
Hybrid Haskell and Python Natural Language Processing
- Example Use of the Haskell NLP Client
- Setting up the Python NLP Server
- Understanding the Haskell NLP Client Code
- Wrapup for Using the Python SpaCy NLP Service
-
Hybrid Haskell and Python For Coreference Resolution
- Installing the Python Coreference Server
- Understanding the Haskell Coreference Client Code
- Wrapup for Using the Python Coreference NLP Service
- Book Wrap Up
-
Appendix A - Haskell Tools Setup
- stack
- Emacs Setup
- Do you want more of an IDE-like Development Environment?
- hlint
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
Do Well. Do Good.
Authors have earned$10,884,695writing, 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
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
- #1
Functional event-driven architecture: Powered by Scala 3
Gabriel VolpeExplore the event-driven architecture (EDA) in a purely functional way, mainly powered by Fs2 streams in Scala 3!
Leverage your functional programming skills by designing and writing stateless microservices that scale, powered by stateful message brokers.
- #2
Book of Monads
Alejandro Serrano MenaIn functional programming, at the heart of input/output, failure, state, logic, and much more, lies a powerful abstraction called monad. This book provides a journey from the very first concepts, to the myriad of monads available to programmers, down to the categorical foundations.
- #3
Functional Programming Made Easier
Charles ScalfaniA Functional Programming book from beginner to advanced without skipping a single step along the way.
In my 40 years of programming, I've felt that programming books always let me down, especially Functional Programming books. So, I wrote the book I wish I had 5 years ago.
Functional Programming will never be easy, but it can be easier.
- #4
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #5
Practical FP in Scala: A hands-on approach
Gabriel VolpeA practical book aimed for those familiar with functional programming in Scala who are yet not confident about architecting an application from scratch.
Together, we will develop a purely functional application using the best libraries in the Cats ecosystem, while learning about design patterns and best practices.
- #6
Introducing EventStorming
Alberto BrandoliniThe deepest tutorial and explanation about EventStorming, straight from the inventor.
- #7
入門 日本語自然言語処理
Masato Hagiwara and Paul O'Leary McCann日本語テキストを処理したい全てのプログラマ・エンジニアの方へ。分かち書きなどの基本から、自然言語生成などの最新の話題までをカバー。動かして学べるコードや、参照文献も付いています。言語学や機械学習の知識が無くても問題ありません。
- #8
Stratospheric
Tom Hombergs, Björn Wilmsmann, and Philip RiecksFrom Zero to Production with Spring Boot and AWS. All you need to know to get a Spring Boot application into production with AWS. No previous AWS knowledge required.
Go to stratospheric.dev for a tour of the contents.
- #9
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.
- #10
Building Virtual Machine Labs: A Hands-on Guide (Second Edition)
Tony RobinsonThe premise of this book is to provide students a hands-on, go-to resource for building a secure, customizable lab environment in order to enable their own specific pursuits.
Top Bundles
- #1
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... - #2
Modern C++ Collection
3 Books
Get All about Modern C++C++ Standard Library, including C++20Concurrency with Modern C++, including C++20C++20Each book has about 200 complete code examples. Updates are included. When I update one of the books, you immediately get the updated bundle. You can expect significant updates to each new C++ standard (C++23, C++26, .. ) and also... - #3
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... - #4
The Indie Python Extravaganza
5 Books
The Indie Python Extravaganza! A collection of books that will help you to improve your knowledge of the Python programming language one page at a time. Join four indie authors in a journey from the basics of Python to the structure of production-ready systems, going through the core features of the language, some intermediate projects and a... - #6
All the Books of The Medical Futurist
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, digital health investments and how technology giants such as Amazon... - #7
Abandon Your Job - Leaving the Rat Race with Python
8 Books
Now, get all the great Python and Freelancing books from finxter.com in one single bundle!Coffee Break Python - All Python BasicsCoffee Break Python Workbook - Practice the basics of PythonCoffee Break Python Mastery Workouts - Practice advanced Python conceptsCoffee Break Python Slicing - All about SlicingCoffee Break Python NumPy - Get started... - #9
Pattern-Oriented Memory Forensics and Malware Detection
2 Books
This training bundle for security engineers and researchers, malware and memory forensics analysts includes two accelerated training courses for Windows memory dump analysis using WinDbg. It is also useful for technical support and escalation engineers who analyze memory dumps from complex software environments and need to check for possible...
