Can I check contain value in hash?

From	Siratinee Sukachai <ploy.sukachai@gmail.com>
Newsgroups	comp.lang.ruby
Subject	Can I check contain value in hash?
Date	2011-04-19 23:02 -0500
Organization	Service de news de lacave.net
Message-ID	<4c6b84f27beab6e6f15f2d315a4bef87@ruby-forum.com> (permalink)

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I have hash which is contain list of string value.
I need to check is the value already contained in the key.
Add add the value to the key if the key is not contained that value.
Can I do that?

like in c#

if(!dict[key].contains(value))
{
  dict[key].add(value);
}

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Can I check contain value in hash? Siratinee Sukachai <ploy.sukachai@gmail.com> - 2011-04-19 23:02 -0500
  Re: Can I check contain value in hash? Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-20 02:49 -0500
    Re: Can I check contain value in hash? Brian Candler <b.candler@pobox.com> - 2011-04-20 03:33 -0500
      Re: Can I check contain value in hash? Robert Klemme <shortcutter@googlemail.com> - 2011-04-20 03:50 -0500
        Re: Can I check contain value in hash? Brian Candler <b.candler@pobox.com> - 2011-04-20 10:25 -0500
          Re: Can I check contain value in hash? Robert Klemme <shortcutter@googlemail.com> - 2011-04-21 02:12 -0500

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