Hi pritesh_ugrankar,

Yes, it's OK to use a single variable to iterate through multiple arrays:

perl -Mstrict -WE '
my @x = (1,2);
my @y = (3,4); 
for my $z ( @x, @y ) {
    say $z;
}        
'
[download]

Output:

1
2
3
4
[download]

If you want to iterate through your arrays one at a time, you can still use the same variable name, since it will be local to the for loop:

perl -Mstrict -WE '
my @x = (1,2);
my @y = (3,4); 
for my $z ( @x ) {
    say $z;
}
for my $z ( @y ) {
    say $z;
}
'
[download]

Output:

1
2
3
4
[download]

For the same reason (locally scoped variable) you can use the same variable name even with nested loops:

perl -Mstrict -WE '
my @x = (1,2);
my @y = (3,4); 
for my $z ( @x ) {
    say $z;
    for my $z ( @y ) {
        say "  $z";
    }
    say $z;
}
'
[download]

Output:

1
  3
  4
1
2
  3
  4
2
[download]

... although this is rarely a good idea, since it makes it less easy to follow the flow of the code.

Variable names are free; go ahead and use another one!

Hope this helps!