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    Some Frequently Operated Design Patterns!

    17 January 2021

    Being a software designer comes with the burden of solving various design problems over and over in different contexts. Design patterns are meant to generate repeatable solutions to commonly occurring problems found during software designing. They have not finished designs that can be directly transformed into codes and the ‘over-use’ of it can result in codes that are difficult to understand and manage. 

    Although design patterns are controversial in some contexts, they are considered quite helpful when used in the right situation for the right reason. The design solutions are tried and tested, allowing programmers to avoid the hassle of figuring out completely new solutions to common problems. Design patterns also allow developers to communicate more effectively by providing common language conceptualizing repeated problems and solutions. 

    There are several different types of design patterns. Here are some of the more frequently used ones:

    Strategy Design Pattern

    Strategy design patterns enable selecting grouping related algorithms at runtime. This allows switching from one algorithm to another without modifying the client. This design pattern does not implement one single algorithm, rather provides instruction on which group algorithm to run. 

    Abstract Factory

    The abstract factory is also known as the factory of factories. It works around a super-factory creating families of related objects without specifying their class. Each of these new factories can generate objects according to the Factory pattern. 

    Template Method

    The template method is a method in an abstract superclass that defines the skeleton of an algorithm in an operation. It lets the client subclasses redefine certain steps of operation without changing the algorithm structure.  

    Composite Pattern

    Composite design patterns ‘compose’ objects into tree-structure to represent part-whole hierarchies allowing clients to treat individual objects uniformly. 

    Observer Pattern

    The observer pattern is used when there are too many relationships between objects. So, if one object changes state, other dependent objects are notified immediately. 

    Design patterns are helpful when used correctly. Knowing the types of design patterns and the ones that are used frequently can help software developers to objectify the most common problems and the solutions to them.