From: brabuhr@...
Date: 2009-11-29T01:21:55+09:00
Subject: Re: iterate over a hash with values containing a array of hashes

On Sat, Nov 28, 2009 at 10:15 AM, Bruno Moura <brunormoura@gmail.com> wrote:
> I need iterate over a hash with values containing a array of hashes for
> build a string with comma values
>
> I tried tranform this
...
> into a string like this:
...
> I believe that this task isn't complex, but for me is difficult to do
> now

How far were you able to get before getting stuck?  The basic way to
iterate over a Hash is each:

irb(main):001:0> hash = {"A" => 1, "B" => 2}
=> {"A"=>1, "B"=>2}
irb(main):002:0> hash.each{|key, value|
irb(main):003:1*   p value
irb(main):004:1> }
1
2
=> {"A"=>1, "B"=>2}

When the values stored in the Hash are Arrays, you can use each within each:

irb(main):005:0> hash = {"A" => [1,2,3], "B" =>[4,5,6]}
=> {"A"=>[1, 2, 3], "B"=>[4, 5, 6]}
irb(main):006:0> hash.each{|key, array|
irb(main):007:1*   p key
irb(main):008:1>   array.each{|element|
irb(main):009:2*     p element
irb(main):010:2>   }
irb(main):011:1> }
"A"
1
2
3
"B"
4
5
6
=> {"A"=>[1, 2, 3], "B"=>[4, 5, 6]}

Does that help get you moving in the right direction?