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Re^3: How Perl can push array into array and then how retrieve

by choroba (Archbishop)
on Nov 25, 2021 at 14:16 UTC ( #11139117=note: print w/replies, xml ) Need Help??


in reply to Re^2: How Perl can push array into array and then how retrieve
in thread How Perl can push array into array and then how retrieve

There is more than one way to do it.

You can compute calculate the numbers from a simple sequence:

my @f; for my $i (0 .. 20) { my @e = (2 * $i, 2 * $i + 1); push @f, \@e; } print map "(@$_)", @f
or you can use the C-style loop to skip over the unwanted numbers:
for (my $i = 0; $i <= 40; $i += 2) { my @e = ($i, $i + 1); push @f, \@e; }
or you can use grep to filter the numbers you want:
for my $i (grep 0 == $_ % 2, 0 .. 40) { my @e = ($i, $i + 1); push @f, \@e; }
etc.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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