From: "Wolfgang Nádasi-Donner" <ed.odanow@...>
Date: 2007-11-18T02:56:53+09:00
Subject: Re: Observe variable set and variable change

unknown wrote:
> a way for also tracing vars inside methods.
> 
> def x()
>   z = 10
>   z = 42
> end

I don't think that there exists some method for this purpose. You can 
use Ruby's trace possibilities or a simple method for looking at local 
variables at special points...

def show_local_vars(bind, *d)
  puts '----- variables -----'
  vars = eval("local_variables", bind)
  (d.length == 0 ? vars : (d.map{|s|s.to_s} & vars)).each do |v|
    begin
      puts "#{v}=#{eval(v,bind)}"
    rescue
      puts "+++++ Variable '#{v}' not defined"
    end
  end
end

def x()
  z = 10
  show_local_vars(binding)
  z = 42
  show_local_vars(binding, :z, :a)
end

x

...outputs...

----- variables -----
z=10
----- variables -----
z=42

Wolfgang Nádasi-Donner
-- 
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