Maybe you want to score points for obfuscation: 
if ({map{$_=>1}($bar,$baz,$boo)}->{$foo})
{
        print "Yes!\n";
}

[download]
A dirty, and almost as quick way is: 
if (grep{$_ eq $foo} $bar, $baz, $boo)
# ...

[download]
If you are comparing frequently, you might want to have a persistent hash which you can refer to on a regular basis. Why create it every time if it is the same?

In reply to Re^2: Comparing against multiple values by tadman
in thread Comparing against multiple values by doran

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