From: Yusuke ENDOH <mame@...>
Date: 2011-05-25T22:54:31+09:00
Subject: [ruby-core:36461] Re: [Ruby 1.9 - Feature #4772] Hash#add_keys

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.

-- 
Yusuke Endoh <mame@tsg.ne.jp>