pipe question

From	wolf volpi <wolf_volpi@yahoo.com>
Newsgroups	comp.lang.ruby
Subject	pipe question
Date	2011-04-03 21:58 -0500
Organization	Service de news de lacave.net
Message-ID	<6351ecc5d2ac52f4b4c9d06ad2930f2c@ruby-forum.com> (permalink)

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What does the pipe in this example do?

  @first_name = @first_name || ''

According to the text book that this example came from, the code ensures
that an instance variable is not nil.  If @first_ name is nil, @first_
name is set to the empty string.

Thank you.

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pipe question wolf volpi <wolf_volpi@yahoo.com> - 2011-04-03 21:58 -0500
  Re: pipe question John Feminella <johnf@bitsbuilder.com> - 2011-04-03 22:08 -0500
    Re: pipe question Robert Klemme <shortcutter@googlemail.com> - 2011-04-04 02:36 -0500
  Re: pipe question Josh Cheek <josh.cheek@gmail.com> - 2011-04-03 22:42 -0500
    Re: pipe question Josh Cheek <josh.cheek@gmail.com> - 2011-04-04 04:58 -0500
      Re: pipe question Brian Candler <b.candler@pobox.com> - 2011-04-05 04:01 -0500
    Re: pipe question 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-04 19:12 -0500
      Re: pipe question Josh Cheek <josh.cheek@gmail.com> - 2011-04-04 22:30 -0500
        Re: pipe question Robert Klemme <shortcutter@googlemail.com> - 2011-04-05 10:27 -0500
        Re: pipe question 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-05 21:06 -0500
        Re: pipe question Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-06 02:00 -0500
      Re: pipe question Josh Cheek <josh.cheek@gmail.com> - 2011-04-05 21:23 -0500
  Re: pipe question wolf volpi <wolf_volpi@yahoo.com> - 2011-04-03 23:55 -0500

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