Book Image

Mastering Reactive JavaScript

By : Erich de Souza Oliveira
Book Image

Mastering Reactive JavaScript

By: Erich de Souza Oliveira

Overview of this book

If you’re struggling to handle a large amount of data and don’t know how to improve your code readability, then reactive programming is the right solution for you. It lets you describe how your code behaves when changes happen and makes it easier to deal with real-time data. This book will teach you what reactive programming is, and how you can use it to write better applications. The book starts with the basics of reactive programming, what Reactive Extensions is, and how can you use it in JavaScript along with some reactive code using Bacon. Next, you’ll discover what an Observable and an Observer are and when to use them.You'll also find out how you can query data through operators, and how to use schedulers to react to changes. Moving on, you’ll explore the RxJs API, be introduced to the problem of data traffic (backpressure), and see how you can mitigate it. You’ll also learn about other important operators that can help improve your code readability, and you’ll see how to use transducers to compose operators. At the end of the book, you’ll get hands-on experience of using RxJs, and will create a real-time web chat using RxJs on the client and server, providing you with the complete package to master RxJs.
Table of Contents (11 chapters)

Chapter 5. The World Changes Too Fast - Operators to Deal with Backpressure

In the last chapter, we learned how we can use an operator to transform the data emitted by an observable, and also how we can chain this operator, making it reusable as each operator creates a new observable which can be used by multiple observers.

We learned how we can use the following four different operators:

  • map()
  • flatMap()
  • filter()
  • reduce()

These operators are the most important and most used in functional reactive programming. We saw examples and diagrams to make sure we understood how we can use these operators.

The usage of these operators goes beyond the last chapter. We will keep using them through the whole book, and we will use them heavily in the last two chapters, since we will create a client and server for a real-time web chat using functional reactive programming (with the RxJS library)

In this chapter, we will cover a common problem in programs and how we can mitigate it using functional reactive programming...