Learn Classes & Objects — a key concept for LLD interviews.
Interactive — Try it yourself!
How to use
1Click any class in the tree (Animal, Dog, Cat, Bird...)
2See its attributes (fields) and methods (functions)
3Notice: Dog has its OWN methods + INHERITED ones from Animal
4Click GoldenRetriever — see 3 levels of inheritance!
In a nutshell
A Class is a blueprint (like a cookie cutter). An Object is an instance (the actual cookie). Class defines attributes + methods. You can create multiple objects from one class, each with different data.