Why just get by in F# when you can program in style. This book goes beyond syntax and into design. It provides F# developers with best practices, guidance, and advice to write beautiful, maintainable, and correct code. This second edition, fully updated for .NET 6 and F# 6, includes all new coverage of anonymous records, the task {} computation expression, and the relationship between types and modules. Stylish F# 6 covers every design decision that a developer makes in constructing F# programs, helping you make the most educated and valuable design choices at every stage of code development. You will learn about the design of types and function signatures, the benefits of immutability, and the uses of partial function application. You will understand best practices for writing APIs to be used by F#, C#, and other languages. Each carefully vetted design choice is supported with compelling examples, illustrations, and rationales. What You Will Learn Know why, when, and how to code in immutable style Use collection functions, piping, and function composition to build working software quickly Be aware of the techniques available to bring error handling into the mainstream of program logic Optimize F# code for maximum performance Identify and implement opportunities to use function injection to improve program design Appreciate the methods available to handle unknown data values Understand asynchronous and parallel programming in F#, and how it differs from C# asynchronous programming Exploit records and anonymous records as low-overhead, easily comparable containers for structured data Who This Book Is For Any developer who writes F# code and wants to write it better

Why just get by in F# when you can program in style! This book goes beyond syntax and into design. It provides F# developers with best practices, guidance, and advice to write beautiful, maintainable, and correct code. Stylish F# covers every design decision that a developer makes in constructing F# programs, helping you make the most educated and valuable design choices at every stage of code development. You will learn about the design of types and function signatures, the benefits of immutability, and the uses of partial function application. You will understand best practices for writing APIs to be used by F#, C#, and other languages. Each carefully vetted design choice is supported with compelling examples, illustrations, and rationales. What You'll Learn Know why, when, and how to code in immutable style Use collection functions, piping, and function composition to build working software quickly Be aware of the techniques available to bring error handling into the mainstream of program logic Optimize F# code for maximum performance Identify and implement opportunities to use function injection to improve program design Appreciate the methods available to handle unknown data values Understand asynchronous and parallel programming in F#, and how it differs from C# asynchronous programming Who This Book Is For Any developer who writes F# code and wants to write it better

This book is a great foundation for exploring functional-first programming and its role in the future of application development. The best-selling introduction to F#, now thoroughly updated to version 4.0, will help you learn the language and explore its new features. F# 4.0 is a mature, open source, cross-platform, functional-first programming language which empowers users and organizations to tackle complex computing problems with simple, maintainable and robust code. F# is also a fully supported language in Visual Studio and Xamarin Studio. Other tools supporting F# development include Emacs, MonoDevelop, Atom, Visual Studio Code, Sublime Text, and Vim. Beginning F#4.0 has been thoroughly updated to help you explore the new features of the language including: Type Providers Constructors as first-class functions Simplified use of mutable values Support for high-dimensional arrays Slicing syntax support for F# lists Reviewed by Don Syme, the chief architect of F# at Microsoft Research, Beginning F#4.0 is a great foundation for exploring functional programming and its role in the future of application development.