Hidden features of Ruby

Posted by squadette on Stack Overflow See other posts from Stack Overflow or by squadette
Published on 2008-09-15T15:34:28Z Indexed on 2010/05/08 3:38 UTC
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Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language.

Try to limit this discussion with core Ruby, without any Ruby on Rails stuff.

See also:

(Please, just one hidden feature per answer.)

Thank you

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