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


9.1. Into reverse: Can you program a reverse() function, but implement it in a recursive fashion? Obviously, the best way to go about this would be using the standard string reverse() method, as detailed in, but that wouldn't do for a question on recursion, would it?

9.2. Climbing steps: Suppose you want to climb up a ladder with n steps. At each time you raise your foot, you may opt to climb up one or two rungs. In how many different ways can you climb up that ladder? For example, you can climb a four-rung ladder in five different ways:

  • Always taking one step at a time
  • Always taking two steps at a time
  • Taking two steps first, then one, and then one
  • Taking one step first, then two, and then one
  • Taking one step first, then another one, and finishing with two