DRY Principle
DRY Principle is a software engineering concept for eliminating duplicated logic across screens and platforms so mobile teams ship maintainable systems.
This definition sits in our Software Engineering glossary cluster alongside Clean Code Principles and SOLID Principles.
Definition of DRY Principle
DRY Principle in practical software engineering means eliminating duplicated logic across screens and platforms. For lean teams, results are strongest when each cycle tracks duplicate code blocks flagged in review instead of architecture theater. A recurring failure mode is premature shared utilities coupling unrelated features, which slows delivery and increases production risk.
Why DRY Principle matters
- It gives a concrete lever to improve duplicate code blocks flagged in review with limited senior bandwidth.
- It connects code quality, API design, and team process to outcomes.
- It reduces rework by making tradeoffs explicit before scale bites.
- It prevents premature shared utilities coupling unrelated features from compounding into release-blocking debt.
Example: DRY Principle on a mobile product team
An engineering team applies DRY Principle by focusing on date formatting extracted once for iOS and Android UI layers. After the next release, they review movement in duplicate code blocks flagged in review and adjust standards or tooling.
Related terms for DRY Principle
Terms that reference DRY Principle
Common questions about DRY Principle
How should a small team adopt DRY Principle without overengineering?
Start where duplicate code blocks flagged in review hurts most and apply DRY Principle to that module or API first. Document the decision, measure impact, then expand only if payoff is clear.
What is the most common mistake with DRY Principle?
The common trap is premature shared utilities coupling unrelated features. When this happens, velocity drops and incidents rise while teams debate patterns instead of shipping.
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