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Hands-On Design Patterns with Kotlin

You're reading from Hands-On Design Patterns with Kotlin Build scalable applications using traditional, reactive, and concurrent design patterns in Kotlin

Product type Paperback

Published in Jun 2018

Publisher Packt

ISBN-13 9781788998017

Length 310 pages

Edition 1st Edition

Languages

Kotlin

Concepts

Design Patterns

Author (1):

Alexey Soshin

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Table of Contents (19) Chapters

Title Page

Copyright and Credits

Dedication

Packt Upsell

Contributors

Preface

1. Getting Started with Kotlin FREE CHAPTER

2. Working with Creational Patterns

3. Understanding Structural Patterns

4. Getting Familiar with Behavioral Patterns

5. Functional Programming

6. Streaming Your Data

7. Staying Reactive

8. Threads and Coroutines

9. Designed for Concurrency

10. Idioms and Anti-Patterns

11. Reactive Microservices with Kotlin

1. Other Books You May Enjoy

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Index

Flyweight

Flyweight is an object without any state. The name comes from being very light.

If you've been reading either one of the two previous chapters, you may already think of a type of object that should be very light: a data class. But a data class is all about state. So, is it related to the Flyweight design pattern at all?

To understand this pattern better, we need to jump back in time some twenty years.

Back in '94, when the original Design Patterns book was published, your regular PC had 4 MB of RAM. One of the main goals was to save that precious RAM because you could fit only so much into it.

Nowadays, some cell phones have 4 GB of RAM. Bear that fact in mind when we discuss what the Flyweight design pattern is all about.

Being conservative

Imagine we're building a 2D side-scrolling arcade platformer. That is, you have your character, which you control with arrow keys or a gamepad. Your character can move left, right, and jump.

Since we're a really small indie company consisting of one...

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Authors (1)

Alexey Soshin

Alexey Soshin

Alexey Soshin is a software architect with 18 years of experience in the industry. He started exploring Kotlin when Kotlin was still in beta, and since then has been a big enthusiast of the language. He's a conference speaker, published writer, and the author of a video course titled Pragmatic System Design

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