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Garth’s code quality scan identifies complexity hotspots and duplicated logic across your codebase, helping you reduce technical debt before it accumulates.

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Code complexity

Garth measures complexity at the function level using two complementary metrics:

Cyclomatic complexity

Measures the number of independent execution paths through a function. High cyclomatic complexity means more test cases are needed and the code is harder to change safely.

Cognitive complexity

Captures how difficult code is to read and understand, accounting for nesting depth, control flow breaks, and logical operators — a better proxy for human comprehension than cyclomatic complexity alone.
Functions that exceed complexity thresholds are flagged in the Garth dashboard with the file path, function name, and complexity score so you can prioritise refactoring effort.

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Duplicate code

Garth scans the codebase for repeated blocks of logic that have been copy-pasted across files or modules.

Duplicate block detection

Identifies code blocks that are identical or near-identical across different files. Each finding shows the affected locations so you can consolidate them into a shared utility.

Duplication percentage

Reports the overall duplication ratio for the repository, giving you a high-level view of how much of the codebase consists of repeated logic.
Reducing duplication lowers maintenance overhead — a bug fixed in one place no longer needs to be fixed in ten.