From: Rodrigo Rosenfeld Rosas <rr.rosas@...>
Date: 2011-05-25T23:04:26+09:00
Subject: [ruby-core:36462] Re: [Ruby 1.9 - Feature #4772] Hash#add_keys

Em 25-05-2011 10:54, Yusuke ENDOH escreveu:
> Hello,
>
> 2011/5/25 Rodrigo Rosenfeld Rosas<rr.rosas@gmail.com>:
>> Actually, as already noticed here, this could be just:
>>
>> ['a', 'b', 'c'].each {|k| hash[k]} # You don't need to assign to it.
>
> The assignment is needed.
>
>    hash = Hash.new {|h,k| k + k.succ}
>    ["a","b","c"].each {|k| hash[k] }
>
>    p hash  #=>  {}<- LOOK!
>
>
> This feature might be useful to use a hash as a set...
> I'm not sure though.

Yes, I didn't read the documentation and believed on Adam statement, 
sorry :)

I think that "add_keys" makes the code more readable than the current 
alternative.

Or maybe "add_keys_with_default_value" :)