Functional Design: Principles, Patterns, and Practices (Robert C. Martin Series)

A Practical Guide to Better, Cleaner Code with Functional Programming In Functional Design, renowned software engineer Robert C. Martin ("Uncle Bob") explains how and why to use functional programming to build better systems for real customers. Martin compares conventional object-oriented coding structures in Java to those enabled by functional languages, identifies the best roles for each, and shows how to build better systems by judiciously using them in context. Martin's approach is pragmatic, minimizing theory in favor of "in the-trenches" problem-solving. Through accessible examples, working developers will discover how the easy-to-learn, semantically rich Clojure language can help them improve code cleanliness, design, discipline, and outcomes. Martin examines well-known SOLID principles and Gang of Four Design Patterns from a functional perspective, revealing why patterns remain extremely valuable to functional programmers, and how to use them to achieve superior results. • Understand functional basics: immutability, persistent data, recursion, iteration, laziness, and statefulness • Contrast functional and object approaches through expertly crafted case studies • Explore functional design techniques for data flow • Use classic SOLID principles to write better Clojure code • Master pragmatic approaches to functional testing, GUIs, and concurrency • Make the most of design patterns in functional environments • Walk through building an enterprise-class Clojure application "Functional Design exudes 'classic-on-arrival'. Bob pulls back the curtain to reveal how functional programming elements make software design simple yet pragmatic. He does so without alienating experienced object-oriented programmers coming from languages like C#, C++, or Java." --Janet A. Carr, Independent Clojure Consultant Cover Half Title Contents Title Page Copyright Page Foreword Preface Acknowledgments About the Author PART I: Functional Basics Chapter 1 Immutability What Is Functional Programming? The Problem with Assignment So Why Is It Called Functional? No Change of State? Immutability Chapter 2 Persistent Data On Cheating Making Copies Structural Sharing Chapter 3 Recursion and Iteration Iteration Very Brief Clojure Tutorial Iteration TCO, Clojure, and the JVM Recursion Chapter 4 Laziness Lazy Accumulation OK, but Why? Coda Chapter 5 Statefulness When We MUST Mutate Software Transactional Memory (STM) Life Is Hard, Software Is Harder PART II: Comparative Analysis Chapter 6 Prime Factors Java Version Clojure Version Conclusion Chapter 7 Bowling Game Java Version Clojure Version Conclusion Chapter 8 Gossiping Bus Drivers Java Solution Driver Route Stop Rumor Simulation Clojure Conclusion Chapter 9 Object-Oriented Programming Functional Payroll Namespaces and Source Files Conclusion Chapter 10 Types PART III: Functional Design Chapter 11 Data Flow Chapter 12 SOLID The Single Responsibility Principle (SRP) The Open-Closed Principle (OCP) Functions Objects with Vtables Multi-methods Independent Deployability The Liskov Substitution Principle (LSP) The ISA Rule Nope! The Representative Rule The Interface Segregation Principle (ISP) Don’t Depend on Things You Don’t Need Why? Conclusion The Dependency Inversion Principle (DIP) A Blast from the Past A DIP Violation Conclusion PART IV: Functional Pragmatics Chapter 13 Tests But What about the REPL? What about Mocks? Property-Based Testing A Diagnostic Technique Functional Chapter 14 GUI Turtle-Graphics in Quil Chapter 15 Concurrency Conclusion PART V: Design Patterns Chapter 16 Design Patterns Review Patterns in Functional Programming Abstract Server Adapter Is That Really an Adapter Object? Command Undo Composite Functional? Decorator Visitor To Close, or to Clojure? The 90-degree Problem Abstract Factory 90 Degrees Again Type Safety? Conclusion Postscript: OO Poison? PART VI: Case Study Chapter 17 Wa-Tor Scratch That Itch Showers Solve Problems It’s Time to Wildly Reproduce What about the Sharks? Conclusion Afterword Index A B C D E F G H I J L M N O P Q R S T U V W Y A Practical Guide to Better, Cleaner Code with Functional Programming In Functional Design , renowned software engineer Robert C. Martin ("Uncle Bob") explains how and why to use functional programming to build better systems for real customers. Martin compares conventional object-oriented coding structures in Java to those enabled by functional languages, identifies the best roles for each, and shows how to build better systems by judiciously using them in context. Martin's approach is pragmatic, minimizing theory in favor of "in the-trenches" problem-solving. Through accessible examples, working developers will discover how the easy-to-learn, semantically rich Clojure language can help them improve code cleanliness, design, discipline, and outcomes. Martin examines well-known SOLID principles and Gang of Four Design Patterns from a functional perspective, revealing why patterns remain extremely valuable to functional programmers, and how to use them to achieve superior results. "Functional Design exudes 'classic-on-arrival'. Bob pulls back the curtain to reveal how functional programming elements make software design simple yet pragmatic. He does so without alienating experienced object-oriented programmers coming from languages like C#, C++, or Java." --Janet A. Carr, Independent Clojure Consultant Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.