Software Design Patterns and Principles - Part 8 (Decorator Design Pattern)

Other Parts of This Series: Part 7: Software Design Patterns and Principles - Part 7 (Adapter Design Pattern) Decorator Design Pattern (Photo Credit: Refactoring.guru) In this series, we try to explore software design patterns and principles. We will try to learn the well-known OOP design patterns one by one. In this part, we try to explore the decorator design pattern. So let’s get started… Story Neela starts a bakery app called “Decorated Cake App.” Here he takes orders for different predefined delicious cakes. His app offers vanilla, chocolate, and other types of cake. Day by day, his app and cake become famous and popular. Now people propose and order cake with their preference and want cake decorated in a more elaborate way with extra functionality. So now, Neela needs to adjust his cake with extra functionality without breaking his existing system. As decorations are based on people’s choices, day by day more and more versatile preferences will come into the scenario, and Neela needs to adjust to those as well. Here Neela is in tension, wondering how he can achieve such cases in an optimized way. ...

November 8, 2025 · 9 min · Saiful Islam Rasel

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