I don't think that given()when() is any big deal.
The "old" Perl ways are more than adequate to do this.
use strict;
use warnings;
sub test1 #An if/else implementation....
{
my ($var1) = @_;
# $var1 = shift; # is slightly faster with one var
# my ($var1, $var2) = @_; # slightly faster than than 2 shifts
# normally this minor difference doesn't matter.
# Perl can implement the if/else idea very code efficiently.
return ("One") if ($var1 == 1);
return ("Two") if ($var1 == 2);
return ("Three") if ($var1 == 3);
return undef;
}
#Using a hash table
#Perl will not re-evaluate %hash for every entry into the sub
#that table will "still be around to use".
sub test2
{
my $in = shift;
my %hash = ( 1 => "One",
2 => "Two",
3 => "Three",
);
return ($hash{$in}) if exists ($hash{$in});
return undef;
}
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