'SOLID Principles in JavaScript: What Does the 'L' Stand For?' solid javascript
setWidth, getArea
In our example, Rectangle and Square are different objects, that contain a little bit similar logic, but at the same time different logic. So, it will be more correct to divide them and not to use them as a "Parent-Child" class. And now, Liskov Substitution Principle says, that if we want to change from base class to subclass, the system should work, as it was before:
But now, we have a problem, our fly method doesn't expect error inside it and the "fly" function was created only for that birds, who can fly. Penguins can't fly, so we break Liskov Substitution Principle.
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