Ruby/Array/group by
Материал из Wiki.crossplatform.ru
Версия от 17:10, 26 мая 2010; (Обсуждение)
Group programming languages by their first letter
langs = %w[ java perl python ruby ] groups = langs.group_by {|lang| lang[0] } p groups # => {"j"=>["java"], "p"=>["perl", "python"], "r"=>["ruby"]}