----- Original Message -----
From: "Marcos Lorenzo de Santiago" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, April 12, 2002 11:59 AM
Subject: can I get the keys from a hash giving the value?
> I got a hash:
>
> %week=("monday" => 1,
> "tuesday" => 2,
> "wednesday" => 3,
> "thursday" => 4,
> "friday" => 5,
> "saturday" => 6,
> "sunday" => 7
> );
>
> and I have $day=1, can I get then "monday"??
based on the fact a hash can be treated as an array, you can do:
my %rev_week = reverse %week;
print $rev_week{1} . "\n";
be careful, this only works if there is a One to Many mapping between keys &
values
e.g. if:
%hash = (
"apple" => 1,
"orange" => 2
"smallorange" => 2
);
%rev_hash = reverse %hash
print $rev_hash{2}
would it print orange OR smallorange? (who can say which one! (there is a
'magical' rule ))
although thats not a problem here.
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