How do I find the key of a specific hash element?

[jshock]

For example:

my %weekdays = (
        0  => "SUN",
        1 => "MON",
        2 => "TUE",
        3 => "WED",
        4 => "THU",
        5 => "FRI",
        6 => "SAT",
);
$weekdays{2}; # gives "TUE"

But what if I know "TUE" and want to find out what the key is? Is
there a construct like $weekdays{"TUE"} that gives 2"


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