CAT 008

CAT-008 — select.first/last → find

Severity: warning • Confidence: high • Auto-fix: ✅

Tip

This rule supports auto-fix via --fix

Description

select.first/last → find — Use find instead of select + first/last to stop early after finding the match.

Bad code

ary.select { |x| x > 0 }.first
ary.select { |x| x > 0 }.last

Good code

ary.find { |x| x > 0 }

Performance Impact

Tip

This rule can significantly improve performance in hot code paths.

Benchmark

Note

See bench results at bench/cat-008/