--- any?
--- any? {|item| ... }

    ruby 1.7 feature:

    ٤ƤǤǤ false ֤ޤǤ
    С true ֤ޤ

    ruby 1.8 feature:
    ֥åȼϡǤФƥ֥åɾ٤Ƥη
    Ǥ false ֤ޤ֥å֤
    ǡ true ֤ޤ

        p [1,2,3].any? {|v| v > 3}   # => false
        p [1,2,3].any? {|v| v > 1}   # => true

