Learn DRY Principle — a key concept for LLD interviews.
Interactive — Try it yourself!
How to use
1See 3 identical code blocks on the left (WET code)
2Click "Apply DRY" — watch them merge into 1 shared function
3See line count drop and complexity meter decrease
4The 3 callers now reference one function — change once, fix everywhere
In a nutshell
DRY = Don't Repeat Yourself. Every piece of knowledge should have a single, unambiguous representation. Duplicated code means duplicated bugs — fix one, forget the others.