From: messju mohr <messju@...>
Date: 2003-09-25T01:48:39+09:00
Subject: Re: Setting "variable" global variable ?

On Thu, Sep 25, 2003 at 01:37:59AM +0900, Dan Doel wrote:
> def global_variable_set(name, val)
>    eval("proc { | x | $#{name} = x }").call val
> end
> global_variable_set("foo", [1, 2, 3])

or simply:

def global_variable_set(name, val)
   eval "$#{name} = val"
end
global_variable_set("foo", [1, 2, 3])


but the original question was how to do it *without* the eval.

greetings
messju


 
> Johan Holmberg wrote:
> 
> >Hi !
> >
> >I wonder if there is any way in Ruby of setting a "variable" global
> >variable at runtime, without  using "eval".
> >
> >For example, could the following be done without "eval":
> >
> >     def my_set_global_variable(name, val)
> >	  eval "#{name} = #{val.inspect}"
> >     end
> >
> >     my_set_global_variable("$foo", [1,2,3])
> >
> >     p $foo          # gives [1, 2, 3]
> >
> >
> >I would like to avoid "serializing" the "val" value above
> >(done with the "inspect" call), and assign the original "val"
> >directly instead.
> >
> >For instance variables there is "instance_variable_set", but is
> >there something corresponding for global variables ?
> >
> >/Johan Holmberg
> >
> >
> >
> > 
> >