From: Dave Thomas <Dave@...>
Date: 2001-05-01T03:55:51+09:00
Subject: [ruby-talk:14449] Re: How to do it the Ruby-way 1

Stefan Matthias Aust <sma@3plus4.de> writes:

> Hi!
> 
> I'm still a Ruby newbie and wonder what is the best way to express the
> following algorithm in Ruby: A cache shall provide a service to access
> the contents of files so that files are read only once.
> 
> class Cache
>   @@cache = {}
>   def Cache.get(name)
>     cache.fetch(name) {@@cache[name] = File.open(name).read}
>   end
> end

A useful idiom is

    @@cache[name] ||= File.open(name).read

Regards


Dave