This code builds an AoA by processing three lines at a time and pushing an anonymous array of chomped lines for each group.
$ perl -Mstrict -Mwarnings -MData::Dumper -e '
sub groupsOf (&$@);
open my $inFH, q{<}, \ <<EOD or die $!;
a
b
c
d
e
f
g
h
EOD
my @arr;
push @arr, groupsOf { chomp @_; [ @_ ] } 3, <$inFH>;
sub groupsOf (&$@)
{
my $rcToRun = shift;
my $groupsOf = shift;
my $rcDoIt;
$rcDoIt = sub
{
$rcToRun->(
map shift, 1 .. ( @_ < $groupsOf ? @_ : $groupsOf )
),
@_ ? &$rcDoIt : ();
};
&$rcDoIt;
}
print Data::Dumper->Dumpxs( [ \ @arr ], [ qw{ *arr } ] );'
@arr = (
[
'a',
'b',
'c'
],
[
'd',
'e',
'f'
],
[
'g',
'h'
]
);
$
I hope this is of interest.
Update: Simpler and assigns to three variables rather than constructing an AoA.
$ perl -Mstrict -Mwarnings -E '
> open my $inFH, q{<}, \ <<EOD or die $!;
> a
> b
> c
> d
> e
> f
> g
> h
> EOD
>
> while ( not eof $inFH )
> {
> my( $i, $j, $k ) =
> map { chomp; $_ }
> map { eof $inFH ? () : scalar <$inFH> }
> 1 .. 3;
> say
> q{$i - }, defined $i ? qq{$i; } : q{undef; },
> q{$j - }, defined $j ? qq{$j; } : q{undef; },
> q{$k - }, defined $k ? $k : q{undef};
> }'
$i - a; $j - b; $k - c
$i - d; $j - e; $k - f
$i - g; $j - h; $k - undef
$
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