for my $ind ( 0 .. $#bb ) {
   say "ind is $ind";
}

##</code><code>##

using ( var enumerator = list.GetEnumerator() ) {
   while ( enumerator.MoveNext() ) {
      var item = emumerator.current;
      // ...
   }
}

##</code><code>##

for ( var item in list ) {
   // ...
}