Learn Inheritance — a key concept for LLD interviews.
Interactive — Try it yourself!
How to use
1Click "Animal" (parent) — see base attributes & methods
2Click "Dog" (child) — see it has its own + inherited from Animal
3Click "GoldenRetriever" — 3 levels deep! Has everything from Animal + Dog
4Notice: makeSound() is OVERRIDDEN in each child → different output
In a nutshell
Inheritance lets a class (child) reuse code from another class (parent). Child gets all parent's attributes & methods, plus can add its own or override existing ones. This avoids code duplication.