From: Robert Klemme <shortcutter@...>
Date: 2008-03-11T02:41:55+09:00
Subject: Re: Sort hashes using values

2008/3/10, Rodrigo Bermejo <rodrigo.bermejo@ps.ge.com>:
> Subbu wrote:
>  > Ruby automatically sorts hashes by keys, which means:
>  >
>  >>> h = {"first"=>2,"second"=>1,"third"=>3}
>  > => {"third"=>3, "second"=>1, "first"=>2}
>  >
>  > How do I sort this by the values? So that I have:
>  > {"second"=>1, "first"=>2, "third"=>3}
>
>
> -------------> http://www.ruby-doc.org/core/classes/Hash.html
>  hsh.sort => array
>  hsh.sort {| a, b | block } => array
>
>  Converts hsh to a nested array of [ key, value ] arrays and sorts it,
>  using Array#sort.
>
>    h = { "a" => 20, "b" => 30, "c" => 10  }
>    h.sort                       #=> [["a", 20], ["b", 30], ["c", 10]]
>    h.sort {|a,b| a[1]<=>b[1]}   #=> [["c", 10], ["a", 20], ["b", 30]]

and with #sort_by

irb(main):001:0> {"first"=>2,"second"=>1,"third"=>3}.sort_by {|k,v| v}
=> [["second", 1], ["first", 2], ["third", 3]]

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end