CAT 006

CAT-006 — hash.keys.each → each_key

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

Tip

This rule supports auto-fix via --fix

Description

hash.keys.each → each_key — Use each_key instead of .keys.each to avoid allocating an intermediate array of keys.

Bad code

hash.keys.each { |k| ... }

Good code

hash.each_key { |k| ... }

Benchmark

Note

See bench results at bench/cat-006/