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DRY: Don't Repeat Yourself

Last updated Feb 9, 2024

“Don’t repeat yourself” (DRY) is a foundational principle in software development, focusing on reducing the repetition of software patterns, substituting them with abstractions, or employing data normalization to eliminate redundancy.

Beyond its technical applications, DRY is a philosophy that encourages efficiency, maintainability, and scalability in code. By adhering to DRY principles, developers aim to minimize the risk of errors and inconsistencies, as each piece of knowledge or logic exists in a single, central location. This approach facilitates more accessible updates and enhances code clarity, as changes must be made in only one place.

DRY is not just about avoiding duplicate code. It’s about recognizing that every piece of knowledge must have a single, unambiguous representation within a system. This principle is crucial in larger codebases where the impact of redundant or duplicated logic can lead to significant challenges in code maintenance and evolution.

Moreover, DRY promotes a deeper understanding and thoughtful application of abstraction. Developers can create a more flexible and cohesive codebase by abstracting common patterns. However, balancing DRY with practicality is essential, as over-abstraction can lead to complex, hard-to-understand code.

Created 2022-09-08