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title: 3 Design Patterns Every Developer Should Learn | daily.dev
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# 3 Design Patterns Every Developer Should Learn

**[Bits and Pieces](https://daily.dev/sources/bit)** · 6 min read · 171 upvotes · 10 comments

## Summary

When numerous algorithms for a given strategy (interface) are required, this pattern comes in handy. Singleton Design Pattern is used when only one instance of a class is required. Observer Design Pattern enables you to set up a subscription mechanism that permits other entities to be alerted of each occurrence on the entity to which you are subscribed.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://blog.bitsrc.io/3-design-patterns-every-developer-should-learn-71a51568ac9d?source=rss----5c2fdf847f4a---4>

## Community discussion

Top comments from developers on daily.dev.

**@yschepens** · 2 upvotes

> This article explains simply and effectively design patterns concerns and what they are really (to avoid missconception) and get 3 examples (the ones prefer by the author ^^) to prove their utilities and why you must know them. Good reading for dev who are discovering pattern and OOP.

**@arielcv96** · 0 upvotes

> Absolutely fascinating and simple the way this dude explains it without losing any details nor making it boring.

**@lucost** · 0 upvotes

> a must to know for any dev!

**@fahad07khan** · 0 upvotes

> It was a great article, learnt a lot

**@mustafa\_el\_gaml** · 0 upvotes

> Very good

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---

Tags: [#general-programming](https://daily.dev/tags/general-programming), [#webdev](https://daily.dev/tags/webdev)

[View this post on daily.dev](https://daily.dev/posts/3-design-patterns-every-developer-should-learn-iq36fcddz)

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