Let’s say you are implementing an online eCommerce shop checkout page and you have been told to implement a feature that will allow customers to choose one of the multiple shipping methods. Each shipping method can have different logics to calculate shipping charges and there can also be a situation where different developers need to implement different algorithms. It will be a bad idea to write a single class with all the calculations and logic in it. You have to split your code in a way that is easy to maintain by different developers and easy to scale if more shipping methods are added in the future. In this tutorial, I will show you how to use a design pattern called Strategy Pattern to not only implement multiple algorithms independently but also switch from one algorithm to another during runtime.
