From: Joel VanderWerf <vjoel@...>
Date: 2002-02-19T14:29:43+09:00
Subject: Re: Anonymous class support

David Corbin wrote:
> 
> I find Java anonymous classes to be very helpful when writing UnitTests,
> because I can overide a method for "one time use" just to verify it gets
> called correctly.
> 
> I realize that I can write a new class that responds to whatever methods
> I need.  But I'm talking about the syntactic convenience of  defining
> the method as part of the the new call.
> 
> Does Ruby have support for anything like this?

This isn't syntactically very simple, but maybe it does what you want:

x = "hello"
def x.upcase
  puts "upcasing..."
  super
end
puts x.upcase

# ==> upcasing...
#     HELLO