From: Trans <transfire@...>
Date: 2007-01-08T10:49:20+09:00
Subject: Re: a most undangerous Hash#store!


Devin Mullins wrote:
> Trans wrote:
> >   # As with #store but adds the key/value pair
> >   # only if the key isn't already in the hash.
> Hrm. ActiveSupport has something similar. You can do
> hash.reverse_merge(key => value).

Astute! Indeed, I am using that too. Though I defined an operator for
it instead:

  hash *= {key=>value}

(I use + as an alias for regular merge, btw.) In general though I would
prefer a simple conditional store method b/c it's (probably) more
efficient for a small numbers of entries and it also reads better. 

T.