Here is a more verbose solution and assumes that your files are being stored in an array.
Not really.
for my $file (sort grep -f, readdir $dh)
works just as well as
for my $file (sort @files)
my $num = 1; is useless and detrimental. It reminds me of
use constant TWO => 2;
when one should rather be doing
use constant NUM_EYES => 2;
There's a point where constants become a hindrance.
my $num = 1;
if (exists $extensions{$key}) {
$extensions{$key} += $num;
}
else {
$extensions{$key} = $num;
}
should be
if (defined $extensions{$key}) {
$extensions{$key} += 1;
}
else {
$extensions{$key} = 1;
}
But why not just use ++? It even works great at incrementing previously undefined values.
++$extensions{$key};
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