CAT 002

CAT-002 — map{}.sum → sum{}

Field	Value
Severity	warning
Confidence	high
Auto-fix	✅

map{}.sum → sum{} — Use sum with a block instead of map + sum to avoid creating an intermediate array.

Bad code

ary.map { |x| x * 2 }.sum

Good code

ary.sum { |x| x * 2 }