From: Robert Klemme <shortcutter@...>
Date: 2010-03-31T18:19:47+09:00
Subject: Re: Pop Quiz: aliasing versus wrapping

2010/3/31 Phrogz <phrogz@mac.com>:
> Below are two files that differ only in the 2nd line of code in each.
> Can you guess what difference they will reveal? I must admit I was
> surprised when I ran into this.
>
> $ cat alias.rb
>  class Object
>    alias_method :to_js, :inspect
>  end

This one always invokes Object#inspect - unless you override #to_js explicitly.

> $ cat wrapped.rb
>  class Object
>    def to_js; inspect; end
>  end

This is the one you really want IMHO: #to_js delegates to whatever
#inspect is present in the class.

Pretty straightforward inheritance behavior - although I'd concede
that it's subtle.

Kind regards

robert

-- 
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