From: Andrew Stewart <boss@...>
Date: 2007-01-05T20:12:08+09:00
Subject: Re: How can I do this better?


On 5 Jan 2007, at 09:05, Sam Kong wrote:

> I find myself to use the following idiom frequently.
>
> def foo i
>   return @cache[i] if @cache[i]
>   @cache[i] = some_method_that_takes_long_time(i)
> end

You could also use the 'overlooked feature of Ruby hashes' and put  
your lengthy method in the block you pass to Hash.new:

http://moonbase.rydia.net/mental/blog/programming/overlooked-feature- 
of-ruby-hashes.html

Regards,
Andy Stewart