From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2009-10-27T00:57:29+09:00
Subject: Re: Setting instance variables from hash parameters (with defaults)

On Mon, Oct 26, 2009 at 4:42 PM, Leslie Viljoen <leslieviljoen@gmail.com> wrote:
> I see this is a shorter way:
>
> module Defaulting
>        def set_params(defs, params)
>                defs.merge(params).each {|name, val| eval "@#{name} = val"}
>        end
> end
>
> ..still, any way to get rid of that eval?

One issue with this approach is that with params you can get arbitrary
instance variables injected, while with the other approach you were
restricting to the ones you had in defaults. This might be a problem
or not...

To get rid of the eval, use instance_variable_set.

Jesus.