Book Image

Mastering JavaScript Functional Programming - Second Edition

By : Federico Kereki
Book Image

Mastering JavaScript Functional Programming - Second Edition

By: Federico Kereki

Overview of this book

Functional programming is a paradigm for developing software with better performance. It helps you write concise and testable code. To help you take your programming skills to the next level, this comprehensive book will assist you in harnessing the capabilities of functional programming with JavaScript and writing highly maintainable and testable web and server apps using functional JavaScript. This second edition is updated and improved to cover features such as transducers, lenses, prisms and various other concepts to help you write efficient programs. By focusing on functional programming, you’ll not only start to write but also to test pure functions, and reduce side effects. The book also specifically allows you to discover techniques for simplifying code and applying recursion for loopless coding. Gradually, you’ll understand how to achieve immutability, implement design patterns, and work with data types for your application, before going on to learn functional reactive programming to handle complex events in your app. Finally, the book will take you through the design patterns that are relevant to functional programming. By the end of this book, you’ll have developed your JavaScript skills and have gained knowledge of the essential functional programming techniques to program effectively.
Table of Contents (17 chapters)
Technical Requirements

Partial currying

The last transformation we will look at is a sort of mixture of currying and partial application. If you google it, in some places you will find it called currying, and in others, partial application, but as it happens, it fits neither, so I'm sitting on the fence and calling it partial currying!

The idea of this is, given a function, to fix its first few arguments and produce a new function that will receive the rest of them. However, if that new function is given fewer arguments, it will fix whatever it was given and produce a newer function, to receive the rest of them, until all the arguments are given and the final result can be calculated. See Figure 7.3:

Figure 7.3: Partial currying is a mixture of currying and partial application. You may provide arguments from the left, in any quantity, until all have been provided, and then the result is calculated...