
Jasmine
Administrator
Jan 19, 2001, 3:23 PM
Post #1 of 1
(3500 views)
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How do I look up a hash element by value?
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(From the Perl FAQ) How do I look up a hash element by value? Create a reverse hash: %by_value = reverse %by_key; $key = $by_value{$value}; That's not particularly efficient. It would be more space-efficient to use: while (($key, $value) = each %by_key) { $by_value{$value} = $key; } If your hash could have repeated values, the methods above will only find one of the associated keys. This may or may not worry you.
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