Code Quality
Measuring, improving, and maintaining the health of your codebase.
16 articlesWhat is code churn?
Code rewritten or deleted soon after it is written. What high churn signals and how to reduce it.
What is code maintainability?
How easily code can be changed without breaking it, and what drives it.
Code Coverage vs Test Coverage: What's the Difference?
Code coverage measures what percentage of source lines run during tests; test coverage is broader — encompassing requirements, risk scenarios, and integration paths that code coverage misses.
What are Coding Standards?
Coding standards are team or industry rules for how code must be written — covering naming, formatting, structure, and error handling — enforced to keep codebases consistent and maintainable.
What is Clean Code?
Clean code is source code that is easy to read, understand, and modify — following principles like single responsibility, meaningful naming, and minimal complexity to reduce long-term maintenance cost.
What is Code Complexity?
Code complexity measures how difficult source code is to understand, test, and maintain — high complexity is a leading predictor of bugs, security vulnerabilities, and maintenance cost.
What is Code Coverage?
Code coverage measures what percentage of source code is executed during automated testing — a proxy for test suite completeness, with line, branch, and path coverage as the main variants.
What is Code Documentation?
Code documentation explains what source code does, why it exists, and how to use it — spanning inline comments, API docs, and architectural guides that make codebases maintainable over time.
What is Code Quality?
Code quality measures how well source code meets standards for correctness, maintainability, security, and performance — the properties that determine whether a codebase is an asset or a liability.
What is Code Refactoring?
Code refactoring is the process of restructuring existing source code without changing its external behavior — improving readability, reducing complexity, and eliminating technical debt.
What is a Code Smell?
A code smell is a symptom in source code that indicates a deeper design problem — not a bug, but a sign that the code will be difficult to maintain, extend, or test.
What is Continuous Quality?
Continuous quality is the practice of measuring and maintaining code quality as an ongoing operational discipline — tracking metrics, enforcing standards, and remediating regressions automatically rather than in periodic reviews.
What is Cyclomatic Complexity?
Cyclomatic complexity is a quantitative measure of the number of independent paths through source code — a reliable predictor of testing difficulty, bug density, and maintenance cost.
What is Software Rot?
Software rot (bit rot or code decay) is the gradual deterioration of software quality over time — as dependencies age, requirements drift, and unchanged code becomes misaligned with a changing environment.
What is Technical Debt?
Technical debt is the accumulated cost of shortcuts, poor design decisions, and deferred quality work in a codebase — it accrues interest in the form of slowed development and increased bug rates.
What is Test Coverage?
Test coverage describes how thoroughly a test suite exercises a system — spanning code coverage, requirement coverage, and risk coverage as complementary measures of test completeness.