From: Robert Klemme <bob.news@...>
Date: 2004-04-16T18:29:12+09:00
Subject: Re: Hash, ==,  key-value comparison


"Florian Gross" <flgr@ccan.de> schrieb im Newsbeitrag
news:c5mvnb$3ktu5$1@ID-7468.news.uni-berlin.de...
> walter@mwsewall.com wrote:
>
> This will work:

.... and burn a lot of mem if both hashes are huge.

Regards

    robert


> irb(main):001:0> class Hash
> irb(main):002:1>   def equal_content?(other)
> irb(main):003:2>     {}.update(self) == {}.update(other)
> irb(main):004:2>   end
> irb(main):005:1> end
> => nil
> irb(main):006:0> hash_a = Hash.new { |h, k| h[k] = rand }
> => {}
> irb(main):007:0> hash_a[:foo] = "bar"
> => "bar"
> irb(main):008:0> hash_a[:qux] = "quz"
> => "quz"
> irb(main):009:0> hash_b = {:foo => "bar", :qux => "quz"}
> => {:foo=>"bar", :qux=>"quz"}
> irb(main):010:0> hash_a.equal_content?(hash_b)
> => true
> irb(main):011:0> {}.equal_content?(:x => 1)
> => false
>
> Regards,
> Florian Gross