Strategy and Factory Pattern Combo

 Strategy and Factory Patterns 

These two design patterns go quite hand in hand. While strategy is a behavioral pattern, the factory is a creational pattern. 

Strategy Patterns: Allows us to create interchangeable code that can be changed at runtime. Basically we create an interface and multiple concrete classes implementing that interface each concrete class would have a algorithm to be applied . Any of these concrete classes can be used as long as they implement the interface.  

Factory Pattern: Allows us to create patterns without specifying the exact type. In this pattern we return an interface and the actual object. The core behavior of the factory pattern is that it allows creation of an object based on an interface and return the same. This works hand in hand with Strategy as factory can take care of creating the object based on the strategy (logic) that has to be applied.