This article discusses how to use SOLID principles in JavaScript with code examples.

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Learn how to apply SOLID principles to write maintainable code in JavaScript. Explore the single responsibility principle, open-closed principle, Liskov substitution principle, interface segregation principle, and dependency inversion principle.

JavaScript SOLID Principles: How to Write Maintainable Code

The example for the Liskov substitution principle illustrates beautifully why you should treat principles as a guideline rather than a law set in stone.
By letting Ostrich inherit from Animal rather than Bird, you are shaping your code after this principle instead of after reality; checking if Ostrich was an instance of Bird will fail. Also, even birds capable of flight have the ability to walk.
So, the solution is to either have an extra attribute “flightless” to indicate those birds that will throw an error if asked to fly, or to have two subclasses for Bird, FlyingBird and FlightlessBird.
Please remember, your code is meant to be maintained by humans, so don’t throw hundreds of lines of unnecessary boilerplate in their way.

not for beginners. my brain aches only after reading what SOLID stands for. crying in noob

Wow, I must say I’m thoroughly impressed with the way you’ve broken down the SOLID principles in your article. You’ve made it so simple and easy to understand, even for developers who may be new to the concept.
It’s crystal clear that adhering to SOLID principles is crucial for achieving top-notch code quality and maintainability. And let’s be honest, who wouldn’t want that? By implementing these principles, developers can easily avoid common pitfalls that lead to spaghetti code and headaches down the line.
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Trust me, you won’t regret it :)
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SOLID principles are a must-know for any serious developer. This article does a great job of explaining how to apply these principles specifically in JavaScript, making it a valuable resource for front-end and back-end developers alike. The code examples are especially helpful in illustrating the concepts. Highly recommended!