From: "Marcin Mielżyński" <lopexx@...>
Date: 2006-01-05T04:08:02+09:00
Subject: Re: Question on iterating a hash

phil swenson wrote:
> I have a hash that looks like this : {"1"=>"0, "3"="1", "45"=>"1", 
> "101"=>"0"}
> 
> What I want is an array of all the keys that have hash values equal to 
> "1" ["3","45"] in this case.
> 
> Yeah, i can just iterate the keys... but it seems like there is a "ruby" 
> way to do this.  Any thoughts?
> 
> thx
> phil
> 

{"1"=>"0", "3"=>"1", "45"=>"1","101"=>"0"}.select{|k,v| 
v=="1"}.map{|e|e.first}

lopex