Book Image

Mastering JavaScript Design Patterns

By : Simon Timms

Book Image

Mastering JavaScript Design Patterns

By: Simon Timms

Overview of this book

Preface

What this book covers

What you need for this book

Who this book is for

Reader feedback

Customer support

Free Chapter

1. Designing for Fun and Profit

1. Designing for Fun and Profit

The road to JavaScript

What is a design pattern?

I. Classical Design Patterns

I. Classical Design Patterns

2. Organizing Code

3. Creational Patterns

4. Structural Patterns

5. Behavioral Patterns

II. Other Patterns

II. Other Patterns

6. Functional Programming

7. Model View Patterns

8. Web Patterns

9. Messaging Patterns

10. Patterns for Testing

11. Advanced Patterns

12. ES6 Solutions Today

Index

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Chapter 9. Messaging Patterns

When Smalltalk was first envisioned, the communication between classes was envisioned as being messages. Somehow we've moved away from this pure idea of messages. We spoke a bit about how functional programming avoids side effects; well, much the same is true of messaging-based systems.

Messaging also allows for impressive scalability as messages can be fanned out to dozens or even hundreds of computers. Within a single application, messaging promotes low coupling and eases testing.

In this chapter, we're going to look at a number of patterns related to messaging. By the end of the chapter, you should be aware of how messages work. When I first learned about messaging, I wanted to rewrite everything using it.

We will be covering:

What's a message anyway?
- Commands
- Events
Request-reply
Publish-subscribe
- Fan out and fan in
Dead-letter queues
Message replay
Pipes and filters

What's a message anyway?

In the simplest definition, a message is a collection...