From: Shyouhei Urabe <redmine@...>
Date: 2009-07-31T06:16:13+09:00
Subject: [ruby-core:24625] [Bug #1844] Immediates Should Not Respond to :dup

Issue #1844 has been updated by Shyouhei Urabe.


# This is a bit radical opinion, I admit.

From my point of view, "determining" whether an object has a method is a wrong idea.
Instead you should just call that method.  Which is:

begin
   obj.method
rescue
   ...
end

instead of:

if obj.respond_to? :method then
   obj.method
else
   ...
end

Why you should avoid respond_to? is that it is nothing special; just a method which can be overridden.  So respond_to? is sometimes not realiable for various reasons.  If you want to make sure, the safest way is to see if it actually quacks like a duck.
----------------------------------------
http://redmine.ruby-lang.org/issues/show/1844

----------------------------------------
http://redmine.ruby-lang.org