From: Robert Klemme <shortcutter@...>
Date: 2010-02-11T21:33:38+09:00
Subject: Re: Find has key from a value

2010/2/11 John Butler <johnnybutler7@gmail.com>:

> I cant seem to figure this out, if i have a hash value can i then get
> the key thats associated to that value.
>
> So the hash.has_value(val)? method will return true or false if that
> value exists in the hash but what i need to know is what is the key for
> the particular value.
>
> Any ideas?

Hash#rassoc

irb(main):001:0> {:foo=>:bar}.rassoc :bar
=> [:foo, :bar]
irb(main):002:0> {:foo=>:bar}.rassoc :foo
=> nil
irb(main):003:0>

You can do

key, = hash.rassoc your_value
Note, the comma is important.

Kind regards

robert

-- 
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