From: Joel VanderWerf <vjoel@...>
Date: 2007-01-14T17:36:43+09:00
Subject: Re: return_on

Gavin Sinclair wrote:
> On Jan 14, 1:34 am, "Trans" <transf...@gmail.com> wrote:
>>   def x
>>     return_on @cache[:x]
>>     # do stuff
>>     @cache[:x] = result_of_stuff
>>   end
>>
> 
> def x
>   @cache[:x] ||= begin
>     # do stuff
>   end
> end

Or (saving an exception handler setup):

def reverse x
   @cache[:x] ||= (
     puts "CACHING"
     x.reverse
   )
end

@cache = {}

p reverse("foo")
p reverse("foo")

__END__

Output:

CACHING
"oof"
"oof"

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407