From: Brian Buckley <briankbuckley@...>
Date: 2005-10-20T19:58:32+09:00
Subject: Re: declaratively caching results of a method

> > > Alrighty, then.  I'll make that change in the next release
.
Here's another change to memoize for your consideration:

Suppose the result of a method call is nil or false, and suppose it
takes a lot of work to find that out.  As written, methods that return
nil or false are not getting speedups from memoize.

How about changing memoize to something like below?

define_method(name) do |*args|
   #cache[args] ||= meth.call(*args)  #what if the cached value is
nil or false?
  cache.has_key?(args) ? cache[args] : cache[args] ||= meth.call(*args)
end

Brian