my $counter = 0;
my @combined;
push @combined, "$_:$array2[$counter++]" for @array1;

##</code><code>##

my $counter = 0;
my @combined = map { "$_:$array2[$counter++]" } @array1;

##</code><code>##

my @combined = map { "$array1[$_]:$array2[$_]" } 0..$#array1;