From: Michael Hale <mhale@...>
Date: 2002-11-24T07:46:41+09:00
Subject: Re: find arguments... is this possible

I noticed that many times I just hang on to the constuctor variables and
use them later.  This code allows me to do that automatically.

class MyClass
	def initialize(first, second)
		local_variables.each { |each| eval("@#{each} = #{each}")
}
	end
	
	def a_method
		p instance_variables.collect { |each| eval("#{each}") }
	end
end

MyClass.new('val1','val2').a_method

Produces:
["val1", "val2"]

-----Original Message-----
From: dblack@candle.superlink.net [mailto:dblack@candle.superlink.net] 
Sent: Friday, November 22, 2002 3:08 PM
To: ruby-talk ML
Subject: Re: find arguments... is this possible


Hi --

On Sat, 23 Nov 2002, Michael Hale wrote:

> I want to get the names of the arguments that are passed into a 
> method.
>
> Example:
>
>  def my_method(first, second, third)
>  	puts <insert call to get parameter names>
>  end
>
>  my_method 1, 2, 3
>
> Should output:
>  first
>  second
>  third
>
> Is there any way to do this?

  irb(main):021:0> def my_method(first,second,third)
  irb(main):022:1> puts local_variables
  irb(main):023:1> end
  nil
  irb(main):024:0> my_method(1,2,3)
  first
  second
  third

(give or take hidden pitfalls, and of course the question I dare not
ask, which is why one would want to do this :-)


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav