编程思想基本概念之函数式编程(Functional Programming)

上一篇中提到了Callback,其实思想本质在于函数式编程,这才是更根本的概念。现在来看下在 Java 中的函数式编程是如何实现。


首先我们看一下在Java中很熟悉的一个代码段:

//接口类,这个应该算是要采用函数式编程方式的要求中的,而不算是函数式编程本身的一部分。 public interface ActionListener { public void actionPerformed(ActionEvent e); } class XListener implements ActionListener{ public void actionPerformed(ActionEvent e){ //action here } } XListener l = new XListener(); iexit.addActionListener(l);
但其实这样的实现方式是比较多余的,其实可以用匿名类来实现。在Java中,我们常说的匿名类,就是函数式编程的思想。来看一下。

iexit.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { //action here } });

而在JavaScript中,则有这样的方式:

$("#element").click(function(){ //do something }); $("div.type").each(function(index){ //do something else with the index });

转载整理自:http://www.iteye.com/topic/539515

Learning C++ Functional Programming by Wisnu Anggoro English | 10 Aug. 2017 | ISBN: 1787281973 | ASIN: B06WVD7CVT | 304 Pages | AZW3 | 2.4 MB Key Features Modularize your applications and make them highly reusable and testable Get familiar with complex concepts such as metaprogramming, concurrency, and immutability A highly practical guide to building functional code in C++ filled with lots of examples and real-world use cases Book Description Functional programming allows developers to divide programs into smaller, reusable components that ease the creation, testing, and maintenance of software as a whole. Combined with the power of C++, you can develop robust and scalable applications that fulfill modern day software requirements. This book will help you discover all the C++ 17 features that can be applied to build software in a functional way. The book is divided into three modules—the first introduces the fundamentals of functional programming and how it is supported by modern C++. The second module explains how to efficiently implement C++ features such as pure functions and immutable states to build robust applications. The last module describes how to achieve concurrency and apply design patterns to enhance your application's performance. Here, you will also learn to optimize code using metaprogramming in a functional way. By the end of the book, you will be familiar with the functional approach of programming and will be able to use these techniques on a daily basis. What you will learn Get to know the difference between imperative and functional approaches See the use of first-class functions and pure functions in a functional style Discover various techniques to apply immutable state to avoid side effects Design a recursive algorithm effectively Create faster programs using lazy evaluation Structure code using design patterns to make the design process easier Use concurrency techniques to develop responsive software Learn how to use the C++ Standard Template Library and metaprogramming in a functional way to improve code optimization About the Author Wisnu Anggoro is a Microsoft Certified Professional in C# programming and an experienced C/C++ developer. He has also authored the books Boost.Asio C++ Network Programming - Second Edition and Functional C# by Packt. He has been programming since he was in junior high school, which was about 20 years ago, and started developing computer applications using the BASIC programming language in the MS-DOS environment. He has solid experience in smart card programming, as well as desktop and web application programming, including designing, developing, and supporting the use of applications for SIM Card Operating System Porting, personalization, PC/SC communication, and other smart card applications that require the use of C# and C/C++. He is currently a senior smart card software engineer at CIPTA, an Indonesian company that specializes in innovation and technology for smart cards. He can be reached through his email at wisnu@anggoro.net. Table of Contents Diving into Modern C++ Manipulating functions in functional programming Applying immutable state to the function Recurring method invocation using recursive algorithm Procrastinating the execution process using Lazy Evaluation Optimizing code with Metaprogramming Running parallel execution using Concurrency Creating and debugging application in functional approach
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