Duplication Apr 2026

Understanding the intent behind the repetition helps determine if it needs fixing.

In software development, occurs when the same logic or data is repeated across multiple parts of a codebase . While often viewed as a "code smell" that increases technical debt, strategic duplication can sometimes be better than a poorly designed abstraction. 1. Types of Duplication duplication

Similar logic that appears in different parts of a system for valid, independent reasons. Changes to one shouldn't necessarily affect the other. duplication

Once you see a definitive pattern, refactor it into a shared function or class. 3. How to Fix Duplication duplication

When you've identified harmful duplication, follow these steps to consolidate it safely: