---
title: "Discussion on \"Design Patterns Handbook - Part IV\" | Hashnode"
description: "Discussion on \"Design Patterns Handbook - Part IV\". Explore the remaining 5 Behavioral Design Patterns: Observer, State, and Strategy. Understand their problems, solutions, and real-world analogies"
url: "https://hashnode.com/posts/design-patterns-handbook-part-iv/66fa8120847156a95d868d5b"
---

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# [Design Patterns Handbook - Part IV](https://tuanhadev.hashnode.dev/design-patterns-handbook-part-iv?utm_source=hashnode&utm_medium=feed)

Explore the remaining 5 Behavioral Design Patterns: Observer, State, and Strategy. Understand their problems, solutions, and real-world analogies

Sep 30, 2024 · 30 min read · tuanhadev.hashnode.dev  
Updated Aug 28, 2025  
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-   [#design-patterns](https://hashnode.com/tag/design-patterns)
-   [#behavioral-design-pattern](https://hashnode.com/tag/behavioral-design-pattern)
-   [#software-architecture](https://hashnode.com/tag/software-architecture)
-   [#object-oriented-programming](https://hashnode.com/tag/object-oriented-programming)
-   [#object-relationship](https://hashnode.com/tag/object-relationship)
-   [#code-organization](https://hashnode.com/tag/code-organization)
-   [#code-maintainability](https://hashnode.com/tag/code-maintainability)
-   [#scalable-web-applications](https://hashnode.com/tag/scalable-web-applications)

## Written by

[Tuan Tran Van](https://hashnode.com/@tuanhadev)

@tuanhadev · Ha Noi, Viet Nam

  
[View profile](https://hashnode.com/@tuanhadev)

tuanhadev

I am a developer creating open-source projects and writing about web development, side projects, and productivity.

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