From: Gregory Seidman <gsslist+ruby@...>
Date: 2006-05-01T20:59:26+09:00
Subject: Re: how to create Class object with name determined at runti

On Mon, May 01, 2006 at 08:52:12PM +0900, Bill Roberts wrote:
} John Johnson wrote:
} > You can use eval() to do that, like so:
} > irb(main):001:0> a='String'
} > => "String"
} > irb(main):002:0> b=eval("#{a}.new")
} > => ""
} > irb(main):003:0> b.class
} > => String
} > irb(main):004:0>
} > 
} > In the second irb line, the contents of the variable _a_ are substituted 
} > in the string before the .new. It amounts to b=eval("String.new").

Avoid using eval when possible.

irb(main):001:0> a='String'
=> "String"
irb(main):002:0> b=Object::const_get(a).new()
=> ""
irb(main):003:0> b.class
=> String
irb(main):004:0>

} > Regards,
} >   JJ
} > 
} >
} John - thanks, also a neat solution.  Having had experience mainly in 
} static/compiled languages previously, I am just getting to grips with 
} Ruby's nice features for adapting itself as it runs.
--Greg