Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up

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4.8 (4 Ratings)

Paperback Dec 2023 418 pages 1st Edition

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Paperback Dec 2023 418 pages 1st Edition

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Soar with Haskell

Functions

While FP has been around for many decades, its following has only been growing rapidly in recent years. More programmers are picking up functional programming languages or are programming in a functional style in non-functional languages than ever before. At the same time, existing non-functional programming languages are adopting a growing number of FP features and libraries.

In these ongoing developments, Haskell stands out as a reference for all. As a purely FP language, it embodies the ideal of FP. As a trailblazer for new (functional) programming language developments, it sets the bar for other languages to follow in its tracks.

Before diving into practical FP, this chapter gives a brief overview of what FP is and how Haskell fits in. Then, we start with our first Haskell functions. We learn how to define and call functions. This includes an explanation of all the syntactic elements (types, type signature, function body, and so on) and their role. Along the way...

Writing basic functions

In this section, we write our first Haskell functions to get acquainted with Haskell’s syntax and basic elements.

Our first function

Let us start with a simple function for incrementing an integer:

increment :: Int -> Int
increment x = x + 1

This function definition consists of two lines. The first line is the type signature and the second line defines the behavior of the function. The type signature states that the function has the name increment and, given a value of the Int type as input, produces a result of the Int type. Here, Int is of course the type of integers such as -1, 0, and 42.

The second line is an equation that says that increment x (where x is any possible input) is equal to x + 1. We can read such an equation also operationally: given any x input, the increment function returns the result x + 1. Here, x is called a variable; it acts as a placeholder for an actual input to the function. The result x + 1 is called the...

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Key benefits

Learn from an expert lecturer and researcher who knows all the ins and outs of Haskell
Develop a clear understanding of Haskell, from the basics through to advanced concepts
Get to grips with all the key functional programming techniques
Purchase of the print or Kindle book includes a free PDF eBook

Description

With software systems reaching new levels of complexity and programmers aiming for the highest productivity levels, software developers and language designers are turning toward functional programming because of its powerful and mature abstraction mechanisms. This book will help you tap into this approach with Haskell, the programming language that has been leading the way in pure functional programming for over three decades. The book begins by helping you get to grips with basic functions and algebraic datatypes, and gradually adds abstraction mechanisms and other powerful language features. Next, you’ll explore recursion, formulate higher-order functions as reusable templates, and get the job done with laziness. As you advance, you’ll learn how Haskell reconciliates its purity with the practical need for side effects and comes out stronger with a rich hierarchy of abstractions, such as functors, applicative functors, and monads. Finally, you’ll understand how all these elements are combined in the design and implementation of custom domain-specific languages for tackling practical problems such as parsing, as well as the revolutionary functional technique of property-based testing. By the end of this book, you’ll have mastered the key concepts of functional programming and be able to develop idiomatic Haskell solutions.

Who is this book for?

If you are a programmer looking to gain knowledge of Haskell who’s never been properly introduced to functional programming, this book is for you. Basic experience with programming in a non-functional language is a prerequisite. This book also serves as an excellent guide for programmers with limited exposure to Haskell who want to deepen their understanding and foray further into the language.

What you will learn

Write pure functions in all their forms – that is basic, recursive, and higher-order functions
Model your data using algebraic datatypes
Master Haskell's powerful type-class mechanism for ad hoc overloading
Find out how Haskell's laziness gets the job done
Reconcile Haskell's functional purity with side effects
Familiarize yourself with the functor, applicative functor, monad hierarchy
Discover how to solve problems with domain-specific languages
Find more bugs with Haskell's property-based testing approach

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Balaji Kothandaraman Feb 25, 2024

“Soar with Haskell” by Tom is a concise yet comprehensive guide that propels readers into the world of Haskell programming. Through clear explanations and practical examples, Tom demystifies Haskell’s concepts, making them accessible to beginners while offering insights for experienced developers. This book serves as an invaluable resource for anyone looking to soar to new heights in functional programming with Haskell.

Amazon Verified review

Jacob Quam Feb 19, 2024

This book is a comprehensive and thoughtfully crafted guide to Haskell and functional programming (FP) that stands as an essential resource for both beginners and experienced programmers alike. From the foundational concepts of FP and Haskell's syntax to advanced topics like type classes, monads, and domain-specific languages, the book covers a wide array of subjects necessary for mastering Haskell and functional programming paradigms.The structure of the book is meticulously organized, starting with the basics of functional programming, such as writing basic functions, understanding primitive types, and leveraging the type checker for more robust code. This foundational knowledge is crucial for anyone new to FP and sets the stage for more complex topics.The chapters on algebraic data types, higher-order functions, and recursion are particularly illuminative, offering clear explanations and practical examples that demonstrate the power and elegance of Haskell. The discussion on type classes and monads—topics often considered challenging for newcomers—is handled with care, making these concepts accessible and understandable.One of the book's strengths is its emphasis on practical application, as seen in the sections on input/output, property-based testing, and parser combinators. These chapters not only deepen the reader's understanding of Haskell's capabilities but also equip them with the tools to tackle real-world programming challenges.Moreover, the exploration of Haskell-specific features, such as lazy evaluation and monad transformers, showcases the unique advantages of Haskell and functional programming. These advanced topics are presented in a way that builds on the reader's existing knowledge, ensuring a deeper and more integrated understanding of the material.The inclusion of questions, further reading suggestions, and answers at the end of each chapter reinforces learning and encourages further exploration. Additionally, the book's approach to teaching Haskell through a combination of theoretical explanations and practical examples makes it an invaluable resource for anyone looking to learn or deepen their understanding of Haskell and functional programming.In summary, this book is a testament to the depth and breadth of Haskell as a programming language. Its clear explanations, practical examples, and thoughtful organization make it an indispensable guide for anyone interested in mastering Haskell and functional programming. Whether you're a beginner eager to learn Haskell from the ground up or an experienced programmer looking to deepen your understanding of functional programming concepts, this book is a valuable addition to your programming library.

Giri Prasath Jan 31, 2024

This book is shows the world to functional programming. It has cover in depth to haskellIt is a great book for haskell enthusiast's.

tushar Jan 28, 2024

This book stands out for its conciseness and direct approach. It assumes a foundational understanding of imperative or object-oriented programming languages, allowing it to dive straight into the intricacies of Haskell without unnecessary repetition. The pacing is well-balanced, offering a comfortable learning curve without feeling rushed or overly slow.One notable strength is the book's coverage of the features in the latest GHC-9 compiler version, a detail often lacking in other resources. This up-to-date content adds significant value for readers aiming to stay current with Haskell development.The only drawback I encountered was the relatively limited number of problems at the end of each chapter. Despite this minor concern, the overall quality of the book makes it a worthwhile investment for anyone looking to make a smooth transition from imperative to functional programming.In summary, this book provides an excellent bridge for programmers familiar with imperative paradigms, offering a clear path into the fascinating world of Haskell."

Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up

What do you get with Print?

Soar with Haskell

Functions

Technical requirements

What is FP?

Programming with functions

Declarative programming

Writing basic functions

Our first function

Programming with primitive types

Int and Integer

Putting the type checker to work

Checking function calls

Combining functions

Calling functions from within functions

Summary

Questions

Further reading

Answers

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Soar with Haskell: The ultimate beginners' guide to mastering functional programming from the ground up

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