Others have given you several solutions, but there is one more.
strict will only cause an error if you try to call the sub
by using a string. It does not stop you taking a reference. So
my $sub = \&{'do_'.$type};
$sub->();
Is perfectly legal. But if you don't want the extra variable (\&{'do_'.$type})->();
will work too. But the benefit of using the variable is that
you can check that the sub actually exists with my $sub = \&{'do_'.$type};
die "Unknown sub 'do_$type'" unless defined(&$sub);
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