Analyse code complexity

How it works

The source is scanned for function declarations and indicators such as if, loops, case, catch, ternary, and logical operators. Each function starts at one, increments for matched decisions, and is assigned a triage band.

• Starting at one follows McCabe’s metric.
• The 1–5, 6–10, and 11+ bands are review heuristics.

Worked example

											function validate(x) {
  if (x > 0 && x < 100) {
    return true;
  } else if (x === 0) {
    return null;
  }
  return false;
}
										

												Cyclomatic Complexity Analysis
Total: 6
Global scope: 1
Functions: 1

Per-function breakdown:
  validate (line 1): 5

Legend: 1-5 = simple, 6-10 = moderate, 11+ = complex
											

When to use this

Refactor reviews, CI trend reports, and teaching examples compare control-flow complexity.

Edge cases

• A token inside a string can be counted if masking misses it.
• Generated code can score high despite low maintenance risk.
• The metric does not measure coupling, readability, or runtime cost.

References