That doesn't quite work. Try it for coffee, and you get 'unknown'. Fix:
if ($punter eq 'coffee') { $drink = 'non alky'; }
elsif ($punter eq 'beer' ) { $drink = 'alky'; }
elsif ($punter eq 'whisky') { $drink = 'proper alky'; }
else { $drink = 'unknown'; }
Alternative:
my %lookup = (
'coffee' => 'non alky',
'beer' => 'alky',
'whisky' => 'proper alky',
);
if (exists $lookup{$punter}) {
$drink = $lookup{$punter};
} else {
$drink = 'unknown';
}
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