From: Robert Klemme <shortcutter@...>
Date: 2008-02-21T01:44:33+09:00
Subject: Re: ||= [] idiom

2008/2/20, Leslie Viljoen <leslieviljoen@gmail.com>:
> On Feb 20, 2008 11:44 AM, Robert Klemme <shortcutter@googlemail.com> wrote:

>  > But it needs the fix Joel pointed out:
>  >
>  > @categories = Hash.new {|h,k| h[k] = []}
>  >
>  > Theoretically this could even be more efficient than
>  >
>  > (@categories[k] ||= []) << v
>  >
>  > because the check is done only once per missing key.
>
> A benchmark does indeed show it to be faster, though you need truly huge arrays
>  to see the difference.

As long as it's not slower for small number of values per key... :-)

Thanks for letting us know!

Cheers

robert


-- 
use.inject do |as, often| as.you_can - without end