From: Suraj Kurapati <snk@...>
Date: 2006-11-18T16:53:10+09:00
Subject: Re: Metaprogammatically define methods.

Max Russell wrote:
> testlist = Array.new
> 
> File.open('readme.txt', 'r') do |eachline|
> 	while (line = eachline.gets)
> 	testlist << line
> 	end
> end
> #puts testlist

testlist = File.open('readme.txt').readlines

> 
> testlist.each { |entry|
> 	code = <<METHOD_TEMPLATE
> 		def test_#{entry}()
> 			puts "testing #{entry}"
> 		end
> METHOD_TEMPLATE
> }
> and then call each method I've defined. However, I'm not sure I'm going 
> about this the correct way.

Use define_method whenever possible. The only case where you would put 
code in a string (and then load it using eval) is if your methods need 
to accept a block argument (define_method does not accept block argument 
until Ruby 1.9).

class Foo
  File.open('readme.txt').readlines.each do |entry|
    define_method "test_#{entry}".to_sym do
      puts "testing #{entry}"
    end
  end
end

Foo.new.test_whatever

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