From: Glenn Ritz <glenn_ritz@...>
Date: 2010-03-09T22:05:54+09:00
Subject: Re: Flatten out Hash

Jean G. wrote:
> On Tue, Mar 9, 2010 at 8:31 PM, Glenn Ritz <glenn_ritz@yahoo.com> wrote:
>> Hi,
>>
>> I would like to take a nested hash that looks like this:
>>
>> {"a"=>{"b"=>{"c"=>1}, "b2"=>{"c2"=>2}}}
>>
>> and turn it into an array of 2 element arrays like this:
>>
>> [["a: b2: c2: ", 2], ["a: b: c: ", 1]]
>>
> 
> My method:
> 
> hash = {"a"=>{"b"=>{"c"=>1}, "b2"=>{"c2"=>2}}}
> array = []
> 
> hash.keys.each do |k1|
>     hash[k1].keys.each do |k2|
>         hash[k1][k2].keys.each do |k3|
>              array << ["#{k1}: #{k2}: #{k3}:",hash[k1][k2][k3]]
>         end
>     end
> end

Thanks, Jean.

It's a good solution.  But it's dependent on there being 3 levels of 
hashes.  What if you didn't know how many levels of nesting there was 
before executing the code?  Suppose the hash looked like this instead:

{"a"=>{"b"=>{"c"=>1}, "b2"=>{"c2"=> {"d2" => 2}}}}

-- 
Posted via http://www.ruby-forum.com/.