From: Robert Klemme <shortcutter@...>
Date: 2012-12-09T21:48:53+09:00
Subject: Re: Searching a hash by value

On Sun, Dec 9, 2012 at 1:35 PM, Ferdous ara <lists@ruby-forum.com> wrote:

> but will this work : #value["host_display_name"] ??
> I will try in a bit ..

No.  For lookup by value you can use Hash#rassoc:

irb(main):003:0> h={"foo" => "bar"}
=> {"foo"=>"bar"}
irb(main):004:0> h.rassoc "bar"
=> ["foo", "bar"]
irb(main):005:0> key, val = h.rassoc "bar"
=> ["foo", "bar"]
irb(main):006:0> key
=> "foo"

Be warned though that this may be inefficient.  You probably want a
second Hash keyed by value.

Kind regards

robert


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