That's an odd way to get subsets of three elements. You can't grab them three at a time and maybe the end one has fewer than three elements? As in the example in the docs for splice? 

sub nary_print {
      my $n = shift;
      while (my @next_n = splice @_, 0, $n) {
        say join q{ -- }, @next_n;
      }
    }
    nary_print(3, qw(a b c d e f g h));
    # prints:
    #   a -- b -- c
    #   d -- e -- f
    #   g -- h

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The way forward always starts with a minimal test.

In reply to Re^3: Sub-setting an Array by 1nickt
in thread Sub-setting an Array by kgherman

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