What I learn from a collapse of a startup.For the last two years I have been working in a startup named DSYNC. It provid

Factory Patterns are normally use to abstract away the logic for create a product.i.e creating a product by passing thro

Decorator Pattern Decorator AddOnDecoractor is-A Beverage SolidCoffeeCLass is-A Beverage Decorator is-A AddOnDecoractor

Observer PatternObserver Pattern is commonly use to implement Pub/Sub model. IObservable Has-A IObservable WeatherStatio

Strategy PatternStrategy Pattern is a commonly used pattern for OOP.The idea is to use Has-A relation replace Is-A relat

In Order TraverseThere are a quite few leet code questions that is based on BST traverse.Here is a general template that