Ryan Lemmer - Haskell Design Patterns
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- Book:Haskell Design Patterns
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Take your Haskell and functional programming skills to the next level by exploring new idioms and design patterns
About This Book- Explore Haskell on a higher level through idioms and patterns
- Get an in-depth look into the three strongholds of Haskell: higher-order functions, the Type system, and Lazy evaluation
- Expand your understanding of Haskell and functional programming, one line of executable code at a time
If youre a Haskell programmer with a firm grasp of the basics and ready to move more deeply into modern idiomatic Haskell programming, then this book is for you.
What You Will Learn- Understand the relationship between the Gang of Four OOP Design Patterns and Haskell
- Try out three ways of Streaming I/O: imperative, Lazy, and Iteratee based
- Explore the pervasive pattern of Composition: from function composition through to high-level composition with Lenses
- Synthesize Functor, Applicative, Arrow and Monad in a single conceptual framework
- Follow the grand arc of Fold and Map on lists all the way to their culmination in Lenses and Generic Programming
- Get a taste of Type-level programming in Haskell and how this relates to dependently-typed programming
- Retrace the evolution, one key language extension at a time, of the Haskell Type and Kind systems
- Place the elements of modern Haskell in a historical framework
Design patterns and idioms can widen our perspective by showing us where to look, what to look at, and ultimately how to see what we are looking at. At their best, patterns are a shorthand method of communicating better ways to code (writing less, more maintainable, and more efficient code).
This book starts with Haskell 98 and through the lens of patterns and idioms investigates the key advances and programming styles that together make modern Haskell. Your journey begins with the three pillars of Haskell. Then youll experience the problem with Lazy I/O, together with a solution. Youll also trace the hierarchy formed by Functor, Applicative, Arrow, and Monad. Next youll explore how Fold and Map are generalized by Foldable and Traversable, which in turn is unified in a broader context by functional Lenses. Youll delve more deeply into the Type system, which will prepare you for an overview of Generic programming. In conclusion you go to the edge of Haskell by investigating the Kind system and how this relates to Dependently-typed programming.
Style and approachUsing short pieces of executable code, this guide gradually explores the broad pattern landscape of modern Haskell. Ideas are presented in their historical context and arrived at through intuitive derivations, always with a focus on the problems they solve.
Ryan Lemmer: author's other books
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Copyright 2015 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: October 2015
Production reference: 1261015
Published by Packt Publishing Ltd.
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Birmingham B3 2PB, UK.
ISBN 978-1-78398-872-3
www.packtpub.com
Author
Ryan Lemmer
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Samuli Thomasson
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Ryan Lemmer is software maker, coach, and strategic advisor based in Cape Town.
With a background in mathematics and computer science and 20 years of developing software in the trenches, Ryan remains inspired and humbled by the process of creating and evolving software.
Ryan is a polyglot programmer, who prefers to think in Haskell.
He loves to learn and facilitate learning for others.
This book is the story of the great work of many people. I would like to thank and acknowledge all of them here. You will meet them in this book, through their work.
Also, thanks to my editors at Packt Publishing for their support: Sonali Vernekar, Ajinkya Paranjape, and Anish Dhurat.
Thanks Lynn and Dain for all the support, and finally, thank you Christine, for everything.
Samuli Thomasson is a keen Haskell programmer who is pursuing an MSc in computer science at the University of Helsinki, Finland. He is interested in novel functional programming paradigms, distributed systems, and advanced type-safe programming methods. He likes reading books on philosophy.
He is very excited about the book Haskell Design Patterns by Ryan Lemmer. He recommends it to all who have a basic knowledge of pure functional programming in place and would like to get familiar with some of the more advanced and compelling features Haskell has to offer.
He enjoys sauna evenings and playing board games with his friends. You can check out his public repositories on Github at https://github.com/SimSaladin.
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This book is not a blow-by-blow translation of the Gang of Four design patterns (distilled out of the object-oriented programming paradigm). Having said that, wherever there is an intersection with Gang of Four patterns, we explore it more deeply.
This book is also not intended as a definitive taxonomy of patterns in functional programming or Haskell. Instead, this book is the story of modern Haskell, one pattern at a time, one line of code at a time. By following the historical arc of development, we can place the elements of modern Haskell in a conceptual framework more easily.
, Functional Patterns the Building Blocks , explores the three pillars of Haskell, that is, first-class functions, lazy evaluation, and the Haskell type system, through the lens of patterns and idioms. We will cover some Gang of Four OOP design patterns along the way.
, Patterns for I/O , explores three ways of streaming I/O, that is, imperative, lazy, and iteratee based. While you're at it, learn about the problem with lazy I/O, together with a solution.
, Patterns for Composition , traces the hierarchy formed by functor, applicative, arrow, and monad, with a focus on how these types compose. Synthesize functor, applicative, arrow, and monad in a single conceptual framework.
, Patterns of Folding and Traversing , demonstrates how fold and map are generalized by Foldable and Traversable, which in turn are unified in a broader context by functional lenses.
, Patterns of Type Abstraction , retraces the evolution of the Haskell type system, one key language extension at a time. We'll explore RankNtypes, existensial types, phantom types, GADTs, the type-case pattern, dynamic types, heterogeneous lists, multiparameter typeclasses, and functional dependencies.
, Patterns of Generic Programming , delves into patterns of generic programming, with a focus on datatype generic programming. We will taste three flavors of generic programming: sum of products generic programming, origami programming, and scrap your boilerplate.
, Patterns of Kind Abstraction , delves into the Haskell kind system and related language extensions: associated types, type families, kind polymorphism, and type promotion. We'll get a sense of type-level programming and then conclude by going to the edge of Haskell: diving into dependently-typed programming.
This book is written against the GHC compiler.
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