Irfan Mehmud

Singleton means a class which can only be instantiate once. If we again try to instantiate the class it will just return us the earlier object. Singleton design pattern is used to implement singleton class. Introduction Without implementing singleton pattern the code will look like this: class NoSingleton: def __init__(self): print("Singleton Constructor called. New Object created.") if __name__ == "__main__": s1 = NoSingleton() s2 = NoSingleton() print(s1 is s2) Output Singleton...

In our last blog we talked about strategy design pattern In today’s blog we will learning a new design pattern. Introduction In real world factory is something from which we get the products. In the same way in LLD, Factory is a class from which we get our objects. Main goal of Factory Design pattern is to seperate business logic and object creation logic. There are 3 types of Factory Design: Simple Factory. (not a design pattern by itself, it is more like a design principle) Factory Method. Abstract Fa...

In today’s blog and the upcoming ones we will be discussing about various design patterns. Officially there are 23 designs patterns. First of all, what do you mean by design pattern ? A design pattern simply means an approach to solve any we face while developing any application. People faced similar problems earlier and come up with 23 design patterns. Instead of reinventing the wheel we use these patterns whenever we we face some specific problem, which we will be discussing in depth. Fundamentally all...