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Functional Programming In JavaScript: How To Improve Your JavaScript Programs Using Functional Techn



Functional Programming in JavaScript teaches JavaScript developers functional techniques that will improve extensibility, modularity, reusability, testability, and performance. Through concrete examples and jargon-free explanations, this book teaches you how to apply functional programming to real-life development tasks




Functional Programming In JavaScript: How To Improve Your JavaScript Programs Using Functional Techn



In complex web applications, the low-level details of your JavaScript code can obscure the workings of the system as a whole. As a coding style, functional programming (FP) promotes loosely coupled relationships among the components of your application, making the big picture easier to design, communicate, and maintain.


Functional Programming in JavaScript teaches you techniques to improve your web applications: their extensibility, modularity, reusability, and testability, as well as their performance. This easy-to-read book uses concrete examples and clear explanations to show you how to use functional programming in real life. If you're new to functional programming, you'll appreciate this guide's many insightful comparisons to imperative or object-oriented programming that help you understand functional design. By the end, you'll think about application design in a fresh new way, and you may even grow to appreciate monads!


Functional programming has a few important concepts that we need to know and understand. By implementing these concepts in your applications, you will end up with more functional code. This will make a huge difference in your application, making it more readable, usable, manageable, easy to test and bug-free.


Functional programming is a really powerful and beautiful paradigm to write better code. It introduces a lot of benefits, such as bug-free applications, efficiency, and making code easier to test, reuse, etc. It not only improves your code but also improves how you code. Even if you work with a language with different paradigm than functional programming, you will still have the concepts in your mind and will apply them.


Functional programming is getting more widely used among JavaScript developers, and in this article we learned about a few functional programming concepts that make this paradigm really shine. There is a variety of other concepts in functional programming, but by following the ones that were mentioned here, you will certainly improve your code and skills.


  • SummaryFunctional Programming in JavaScript teaches JavaScript developers functional techniques that will improve extensibility, modularity, reusability, testability, and performance. Through concrete examples and jargon-free explanations, this book teaches you how to apply functional programming to real-life development tasksPurchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications.About the TechnologyIn complex web applications, the low-level details of your JavaScript code can obscure the workings of the system as a whole. As a coding style, functional programming (FP) promotes loosely coupled relationships among the components of your application, making the big picture easier to design, communicate, and maintain.About the BookFunctional Programming in JavaScript teaches you techniques to improve your web applications - their extensibility, modularity, reusability, and testability, as well as their performance. This easy-to-read book uses concrete examples and clear explanations to show you how to use functional programming in real life. If you're new to functional programming, you'll appreciate this guide's many insightful comparisons to imperative or object-oriented programming that help you understand functional design. By the end, you'll think about application design in a fresh new way, and you may even grow to appreciate monads!What's InsideHigh-value FP techniques for real-world uses

  • Using FP where it makes the most sense

  • Separating the logic of your system from implementation details

  • FP-style error handling, testing, and debugging

  • All code samples use JavaScript ES6 (ES 2015)

  • About the ReaderWritten for developers with a solid grasp of JavaScript fundamentals and web application design.About the AuthorLuis Atencio is a software engineer and architect building enterprise applications in Java, PHP, and JavaScript.Table of ContentsPART 1 THINK FUNCTIONALLYBecoming functional

  • Higher-order JavaScript

  • PART 2 GET FUNCTIONALFew data structures, many operations

  • Toward modular, reusable code

  • Design patterns against complexity

  • PART 3 ENHANCING YOUR FUNCTIONAL SKILLSBulletproofing your code

  • Functional optimizations

  • Managing asynchronous events and data



The authors of this article have fallen in love with functional programming over recent years. We started using JavaScript libraries that encouraged a more functional style and then jumped right into the deep end by learning how to code in Haskell.


Programming JavaScript in a functional style has become much more popular in recent years, particularly with the rise of React. React uses a declarative API that suits a functional approach, so having a solid understanding of the principles of functional programming will improve your React code.


Hence, when you learn a functional programming language, it can be reused also for visual aspects of your program in contrast to learning another separate syntax for templating. In React, for example, thanks to the ingenious Virtual DOM system, we can easily apply: map, filter, and reduce functions, well known in functional programming. They can be easily applied in component rendering definition:


Functional programming is used when solutions are easily expressed in functions and have little physical meaning. While object-oriented programs model code after real-world objects, functional programming excels at mathematical functions where intermediate or end values have no physical correlation.


One major difference between object-oriented programming and functional programming is that functional programs avoid constructions like If-Else statements or loops that can create different outputs on each execution.


Java does not truly support functional programming as Python or JavaScript does. However, we can mimic functional programming behavior in Java by using lambda functions, streams, and anonymous classes.


Functional programming is formally a programming paradigm: A set of rules that define how to structure your program in a way that will achieve a certain goal, in a functional way as opposed to a procedural way.


However, when ES6 was released, JavaScript began to add a more comprehensive functional programming tool belt that allowed developers to focus on the actual operations they were performing, rather than defining operations using constructs like for.


Creating complex programs with these seems impossible at first, which creates the artificial learning curve that most people experience. But sticking to these restrictions (especially during deep-dives in pure functional languages) opened my eyes to the true value of functional programming.


All functional programming libraries in JavaScript have a large library of operations available by default, for use in composing your application. But, upon closer inspection, I found that most of these operations are simply repeated/replicated by each different library, and every now and then they may have a different name.


Readability is most impacted by familiarity, and functional programming achieves this by using the aforementioned tool belt of functions. They are similarly named in almost every functional language, and use a naming convention that is (mostly) designed to be easily recognisable.


The JavaScript world is very active. A few years ago only a few developers had the idea of functional programming. But over the last three years, almost every large application code base was using the ideas from functional programming. And there are objective reasons for that:


These days developers try to solve the problem of parallel processing and working with Big Data. By parallelizing the processing of these data you get the desired result quite fast. Plus, do not forget about decentralized (distributed) calculations like blockchain. Due to functional programming principles, the functional code is the most suitable for such computations. The use of all basic API techniques facilitates the parallel execution of the code and its support.


Functional programming is the programming technique that accentuates the functional factors required for creating and implementing the programs. OOP or the Object-Oriented Programs are the conceptual programming techniques that uses objects as the key. The programming model used in functional programming is a declarative programming model, while object-oriented programming uses the imperative programming model. In functional programs, variables and functions are the main elements of the code, while in object-oriented programs, objects and methods are the key elements.


The most primitive version of JavaScript is known as Vanilla JavaScript, which uses custom codes and programming. Since then, several frameworks have been built using the JS syntax, like React, Node, Angular, and more, and these offer additional functionality to the application.


Jquery is the go-to library for JavaScript programming due to its age and flexibility of use. Furthermore, it improves efficiency and adds even more functionality to the programming language by building from its new features. But, first, let's look at how the syntax differs from traditional JavaScript.


R is a low-level, functional programming language and software environment, mainly aimed at statistical computing and graphical techniques. There is a vast library of tools that come with the language, including machine learning algorithms and other useful tools. 350c69d7ab


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