End_eval

Ruby
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

2

On 6/26/06, Brad C. [email protected] 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.

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

It’s what’s called a heredoc.

-austin

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