Learn Builder Pattern — a key concept for LLD interviews.
Interactive — Try it yourself!
How to use
1Select "Builder" tab — see an empty lot
2Click Foundation → Walls → Roof → Interior (in order)
3Watch the house build up step by step visually
4Reset and try — each step adds to the previous. See the builder chain code
In a nutshell
Builder Pattern constructs complex objects step by step. Like building a house — foundation first, then walls, then roof. Allows different representations using the same construction process.