From: Jos Backus <jos@...>
Date: 2010-08-10T09:29:27+09:00
Subject: Re: Overriding ENV[]

On Tue, Aug 10, 2010 at 06:58:00AM +0900, Jess Gabriel y Galn wrote:
> You can use alias_method like this:
> 
> irb(main):001:0> a = [1,2,3]
> => [1, 2, 3]
> irb(main):005:0> class << a
> irb(main):006:1> alias_method :old, :[]
> irb(main):007:1> end
> => #<Class:#<Array:0x2932038>>
> irb(main):008:0> a.old(0)
> => 1
> irb(main):009:0> class << a
> irb(main):010:1> def [](val)
> irb(main):011:2> old(val).to_s.upcase
> irb(main):012:2> end
> irb(main):013:1> end
> => nil
> irb(main):014:0> a[0]
> => "1"
> 
> I tested with an array, but ENV should work too.
 
This works, thanks Jes�s. I tried

    alias_method :old_[], :[]

which produces a syntax error. I should have tried a little harder.

-- 
Jos Backus
jos at catnook.com