Functional Programming with C# - Helion

ebook

Autor: Simon J. Painter
ISBN: 9781492097037
stron: 328, Format: ebook
Data wydania: 2023-09-12
Księgarnia: Helion

Cena książki: 245,65 zł (poprzednio: 285,64 zł)
Oszczędzasz: 14% (-39,99 zł)

Osoby, które kupiły tę książkę, wybierały także »

After decades of relative obscurity, functional programming is finally coming into its own. With concise, easy-to-read code that supports asynchronous, concurrent processing, aspects of functional programming have begun to appear in several traditionally object-oriented languages such as C# and Java. This practical book shows C# programmers how to use functional programming features without having to navigate an entirely new language.

Because of the shared runtime environment common to C# and F# languages, it's possible to use most of F#'s functional features in C# as well. Author Simon J. Painter explains how you can write functional code in C# right away, without having to install dependencies or features newer than .NET 3. You'll learn why functional programming concepts can bring immediate benefit to your work.

Learn what functional programming is and how it originated
Discover features of the functional paradigm using a more familiar language
Start coding functionally in C# right away, without relying on third-party libraries
Write code that's more robust, less error prone, and easier to test
Examine less conventional ways to look at structures available in C#
Explore the practicalities of using functional C# in a business environment

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Spis treści

Functional Programming with C# eBook -- spis treści

Preface
- Who Should Read This Book?
- Why I Wrote This Book
- Navigating This Book
- Conventions Used in This Book
- Using Code Examples
- OReilly Online Learning
- How to Contact Us
- Acknowledgments
1. Introduction
- What Is Functional Programming?
  - Is It a Language, an API, or What?
  - The Properties of Functional Programming
    - Immutability
    - Higher-order functions
    - Expressions rather than statements
    - Expression-based programming
    - Referential transparency
    - Recursion
    - Seriously, recursion
    - Pattern matching
    - Stateless
- Baking Cakes
  - An Imperative Cake
  - A Declarative Cake
- Where Does Functional Programming Come From?
- Who Else Does Functional Programming?
  - Pure Functional Languages
  - Is It Worth Learning a Pure Functional Language First?
  - What About F#? Should I Be Learning F#?
  - Multiparadigm Languages
- The Benefits of Functional Programming
  - Concise
  - Testable
  - Robust
  - Predictable
  - Better Support for Concurrency
  - Reduced Code Noise
- The Best Places to Use Functional Programming
- Where You Should Consider Using Other Paradigms
- How Far Can We Take This?
- Monads Actually, Dont Worry About This Yet
- Summary
I. What Are We Already Doing?
2. What Can We Do Already?
- Getting Started
- Writing Your First Functional Code
  - A Nonfunctional Film Query
  - A Functional Film Query
- Focusing on Results-Oriented Programming
- Understanding Enumerables
- Preferring Expressions to Statements
  - The Humble Select
    - Iterator value is required
    - No starting array
  - Many to One: The Subtle Art of Aggregation
  - Customized Iteration Behavior
- Making Your Code Immutable
- Putting It All Together: A Complete Functional Flow
- Taking It Further: Develop Your Functional Skills
- Summary
3. Functional Coding in C# 7 and Beyond
- Tuples
- Pattern Matching
  - Procedural Bank Accounts
  - Pattern Matching in C# 7
  - Pattern Matching in C# 8
  - Pattern Matching in C# 9
  - Pattern Matching in C# 10
  - Pattern Matching in C# 11
- Read-Only Structs
- Init-Only Setters
- Record Types
- Nullable Reference Types
- The Future
  - Discriminated Unions
  - Active Patterns
- Summary
4. Work Smart, Not Hard with Functional Code
- Its Time to Get Func-y
  - Funcs in Enumerables
  - A Super-Simple Validator
  - Pattern Matching for Old Versions of C#
- Make Dictionaries More Useful
- Parsing Values
- Custom Enumerations
  - Query Adjacent Elements
  - Iterate Until a Condition Is Met
- Summary
II. Into the Belly of the Functional
5. Higher-Order Functions
- A Problem Report
- Thunks
- Chaining Functions
- Fork Combinator
- Alt Combinator
- Compose
- Transduce
- Tap
- Try/Catch
- Handling Nulls
- Update an Enumerable
- Summary
6. Discriminated Unions
- Holiday Time
- Holidays with Discriminated Unions
- Schrödingers Union
- Naming Conventions
- Database Lookup
- Sending Email
- Console Input
- Generic Unions
  - Maybe
  - Result
  - Maybe Versus Result
  - Either
- Summary
7. Functional Flow
- Maybe, Revisited
  - Maybe and Debugging
  - Map() Versus Bind()
  - Maybe and the Primitives
  - Maybe and Logging
  - Maybe and Async
  - Nested Maybes
- The Laws
  - Left Identity Law
  - Right Identity Law
  - Associativity Law
- Reader
- State
- Maybe a State?
- Examples Youre Already Using
  - Enumerable
  - Task
- Other Structures
- A Worked Example
- Summary
8. Currying and Partial Application
- Currying and Large Functions
- Currying and Higher-Order Functions
- Currying in .NET
- Partial Application
- Partial Application in .NET
- Summary
9. Indefinite Loops
- Recursion
- Trampolining
- Custom Iterator
  - Understanding the Anatomy of an Enumerator
  - Implementing Custom Enumerators
  - Indefinitely Looping Enumerables
  - Using Indefinite Iterators
- Summary
10. Memoization
- Bacon Numbers
- Implementing Memoization in C#
- Summary
III. And Out the Other Side
11. Practical Functional C#
- Functional C# and Performance
  - Baseline: An Imperative Solution
  - Performance Results
    - Imperative baseline results
    - Definite loop solutions
    - Indefinite loop solutions
    - Interop with F# performance
    - External factors and performance
- What Does All of This Mean?
- Functional C# Concerns and Questions
  - How Functional Should I Make My Codebase?
  - How Should I Structure a Functional C# Solution?
  - How Do I Share My Functional Methods Among Applications?
  - Did You Order This Pizza?
  - How Do I Convince My Teammates to Do This Too?
  - Is It Worth Including F# Projects in My Solution?
  - Will Functional Coding Solve All My Problems?
  - Connery, Moore, or Craig?
  - How Do I Think Through a Problem Functionally?
  - What If Theres No Way to Make a Bit of Code as High-Performant as Id Like with Functional-Style Code?
- Summary
12. Existing Functional Programming Libraries in NuGet
- OneOf
- LanguageExt
  - Option
  - Either
  - Memoization
  - Reader
  - State
  - LanguageExt Wrap-up
- Functional.Maybe
- CSharpFunctionalExtensions
  - Maybe
  - Result
  - Fluent Assertions
  - CSharpFunctionalExtensions Wrap-up
- The F# Programming Language
- Summary
13. The Martian Trail
- Story
- Technical Detail
- Creating the Game
  - The Solution
  - Communications
  - Want to Learn How to Play?
  - The Inventory Setup
  - The Game Loop
    - Creating a weather report
    - Choosing what to do this turn
    - Updating progress
- Summary
14. Conclusion
- What Kind of Day Has It Been?
- Where Do I Go from Here?
  - More Functional C#
  - Learn F#
  - Pure Functional Languages
- What About You?
Index