--- capitalize
--- capitalize!

    Ƭʸ(ե٥åȤǤ)ʸˡĤʸѹޤ

    capitalize ѹʸ֤ޤ
    capitalize!  self ѹ֤ޤѹ
    ʤä nil ֤ޤ

        p "foobar".capitalize   # => "Foobar"

    $KCODE ŬڤꤵƤʤСɤΰѴ
    Ƥޤޤ(ϡShiftJIS ɤǵޤ)
    դˡ$KCODE ꤷƤޥХʸΥե٥å
    Ͻޤ

        # -*- Coding: shift_jis -*-
        $KCODE ='n'
        puts "".capitalize # => 

    upcase, downcase, swapcase 
    ⻲ȤƤ

