If "L" in "blob" stands for "large", and script is anything but a throw-away one-liner, I'd be unhappy about implicitly building large useless intermediate lists.
use strict;
use warnings;
use feature 'say';
use Data::Dump 'dd';
use Benchmark 'cmpthese';
my $data = "1ABCD2EFGH3IJKL4MNOP5QRST6UVWX" x 1000;
cmpthese -3, {
1 => sub {
my @out;
for ( my $x = 0; $x < length $data; $x += 5 ) {
push @out, [ unpack "CA4", substr $data, $x, 5 ]
}
return \@out
},
2 => sub {
[ map [ unpack 'CA4', $_ ], unpack "(A5)*", $data ]
}
};
__END__
Rate 2 1
2 34.2/s -- -21%
1 43.1/s 26% --
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