What is Code Smell? — UK Software Development Guide
Direct Answer
A code smell is a surface indication in code that suggests there may be a deeper problem with the code's design or quality. Code smells are not bugs — the code may work correctly — but they indicate areas where the code has deviated from good design principles and may accumulate technical debt. Common examples: long methods, duplicate code, large classes, and deeply nested logic.
Code-smell in the UK
Code smells have commercial significance for UK businesses. Technical debt caused by code smells has a measurable cost: an average of 23 additional minutes of development time per hour of work for developers working in "smelly" codebases (McKinsey Digital study). For UK regulated software: code smells in security-critical code (authentication, access control, data processing) are particularly dangerous — complex, difficult-to-read security code is harder to audit and more likely to contain vulnerabilities. ClickMasters code reviews specifically look for common code smells as leading indicators of technical debt accumulation.
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