Deep Nesting (ARCH6184)

Key ruby.quality.deep-nesting · Severity warning · Category quality

if/while/begin blocks nested beyond the threshold produce hard-to-read, hard-to-trace flow and can usually be fixed with early returns or extraction.

Incorrect

def grade(user)
  if user
    if user.active?
      if user.score > 50
        return "pass"
      end
    end
  end
  "fail"
end

Correct

def grade(user)
  return "fail" unless user&.active?
  return "fail" unless user.score > 50
  "pass"
end

Fix

Return early with guard clauses or extract nested blocks into separate methods to flatten the depth.