End_eval

ruby-talk
1

Trying to teach myself some metaprogramming and have been sifting
through the rails source. I often see:
module_eval << -end_eval
   stuff to add
end_eval

I understand what this does, but I'm curious what part of the language
the -end_eval construct is coming from.

Thanks,
Brad

···

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2

module_eval <<-EOS
  string-of-stuff-to-add
EOS

It's what's called a heredoc.

-austin

···

On 6/26/06, Brad Chase <bachase@gmail.com> wrote:

Trying to teach myself some metaprogramming and have been sifting
through the rails source. I often see:
module_eval << -end_eval
   stuff to add
end_eval

I understand what this does, but I'm curious what part of the language
the -end_eval construct is coming from.

--
Austin Ziegler * halostatue@gmail.com * http://www.halostatue.ca/
               * austin@halostatue.ca * http://www.halostatue.ca/feed/
               * austin@zieglers.ca

3

it's the same as print << -HERE
HERE
the - means HERE does not have to be the first part of the line and can be indented
Brad Chase wrote:

···

Trying to teach myself some metaprogramming and have been sifting through the rails source. I often see:
module_eval << -end_eval
   stuff to add
end_eval

I understand what this does, but I'm curious what part of the language the -end_eval construct is coming from.

Thanks,
Brad