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  1. or download this
    my @arr = qw/1 2 3 4 5 6 7 8/;
while(my ($x,$y) = splice @arr,0,2) {
  say "$x => $y";
}
  2. or download this
    my @arr = qw/1 2 3 4 5 6 7 8/;

...
for(keys %hash) {
  say "$_ => $hash{$_}"
}
  3. or download this
    1 => 2
3 => 4
7 => 8
5 => 6
  4. or download this
    my @arr = qw/1 2 3 4 5 6 7 8/;
push @arr, undef;
...
for(@{$x}){
  say $_ ." => " . $y->[$i++] if($_);
}