Node.js Design Patterns Third Edition Exercise Solutions

In this page, we are collecting solutions for the exercises proposed in the book directly from the readers.

If you have completed some of them and want to share your solution, please edit this page and link your repository (or gist) with the solution.

This is the expected format for a new entry:

- [Solution](<LINK TO YOUR SOLUTION>) ([@<YOUR GITHUB USERNAME>](<YOUR GITHUB PROFILE URL>))

Make sure to use the preview mode, to validate that your entry will be shown correctly!

Thank you! 🤩

Chapter 1: The Node.js Platform

No exercise in this chapter

Chapter 2: The Module System

No exercise in this chapter

Chapter 3: Callbacks and Events

3.1 A simple event

3.2 Ticker

3.3 A simple modification

3.4 Playing with errors

Chapter 4: Asynchronous Control Flow Patterns with Callbacks

4.1 File concatenation

4.2 List files recursively

4.3 Recursive find

Chapter 5: Asynchronous Control Flow Patterns with Promises and Async/Await

5.1 Dissecting `Promise.all()`

5.2 TaskQueue with promises

5.3 Producer-consumer with promises

5.4 An asynchronous `map()`

Chapter 6: Coding with Streams

6.1 Data compression efficiency

6.2 Stream data processing

6.3 File share over TCP

6.4 Animations with Readable streams

Solution (@hosseinnedaee)
Solution (@levanchien)

Chapter 7: Creational Design Patterns

7.1 Console color factory

7.2 Request builder

7.3 A tamper-free queue

Chapter 8: Structural Design Patterns

8.1 HTTP client cache

8.2 Timestamped logs

8.3 Colored console output

8.4 Virtual filesystem

8.5 The lazy buffer

Chapter 9: Behavioral Design Patterns

Exercise 9.1 Logging with Strategy

Exercise 9.2 Logging with Template

Exercise 9.3 Warehouse item

Exercise 9.4 Logging with Middleware

Solution (@levanchien)
Solution (@kasymbayaman)

Exercise 9.5 Queues with iterators

Chapter 10: Universal JavaScript for Web Applications

10.1 A matter of style

Solution(@CurtisSlone)