Magical Haskell
Magical Haskell
modern functional programming and type theory in a fun and accessible way
About the Book
Typed functional programming is the future, "techtonic" shift waiting to happen. However, accessible materials to help people efficiently master it without resorting to either trying to draw analogies from the imperative world or on the contrary, using a very technical and math-heavy top-down approach, are in high demand. This is an attempt to explain the elegance of modern functional programming patterns using Haskell as a primary language in a visual, accessible, and engaging way building on the foundation of math but without imperative crutches or heavily technical machinery.
Starting from Types, their creation, relations between each other and structure, „Magical Haskell“ gently builds up to what is considered complex and normally difficult to understand concepts - monads, using monad transformer stacks to structure real programs, foldable and traversable structures, and other interesting useful typeclasses - helping a reader to structure them neatly and use efficiently.
This is book 1 in a 5-book series, laying the foundation for future advanced topics.
About the Author
Table of Contents
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How this book came to be: instead of an introduction
-
- Well, no, it’s a cloud.
- But who in the world has time for this?!
- So, how do we teach Haskell to kids or help adults master its’ power faster and more efficiently?
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- Short Introduction: How To Read This Book
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How this book came to be: instead of an introduction
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Part 1: Foundation
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Chapter 1: Wizards, Types, and Functions
- Functional Programming Is Magic
- Solving Problems As Wizards Do
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Let’s Fall In Love With Types!
- A Char and an Int walk into a bar and make a Function
- How FunTypical!
- Curry and Recurse!
- Conclusion
- Mage’s Toolbox 1: Simple Types, Simple Functions, Recursion, If-Else
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Chapter 2: Type Construction
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House of cards with a little help from Algebra
- Algebraic Data Types
- Records
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Type Functions Are Functions, Maybe?
- Advanced: On Data Constructors and Types
- List, Recursion on Types and Patterns
- Lift me up!
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House of cards with a little help from Algebra
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Chapter 3M: Very Gentle Type Theory and Category Theory Intro
- Types and Functions
- Maybe and Advanced Generalized Functions
- Dependent Function Types (PI-types)
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Chapter 1: Wizards, Types, and Functions
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Part 2: I Wanna Be FAMIOus!
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Chapter 4: Basic Typeclasses or “Show Me A Monoid”
- Show Typeclass
- Algebra is cool
- Typeclasses Hierarchy in Haskell
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Chapter 5: Functor, Bifunctor, Trifunctor enter an elevator…
- Functor Typeclas Definition
- 3-Dimensional Vector Example
- Tracking Players in our Game
- You are Either Functor or a Bifunctor
- PlayerData as a Bifunctor
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Chapter 6: Applicative Application of the Applicants
- We need a bigger Lift
- Action! Apply! Cut!
- Chapter 7: O, Monad, Help me Compose!
- Chapter 8: Input, Output, IO
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Chapter 4: Basic Typeclasses or “Show Me A Monoid”
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Part 3: Getting Real
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Chapter 9: Real-World Programs
- Designing Types and Functions
- Stacking Monads
- Chapter 10: Mutable Variables, Vectors, Type Families
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Chapter 11: Folding stuff, Traversing structures
- Functional data structures
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What killed the
forloop
- Conclusion and future books in the series
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Chapter 9: Real-World Programs
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