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  1. or download this
    my @x = (1..10);
foreach (@x) {
...

OUTPUT: 
101 102 103 104 105 106 107 108 109 110
  2. or download this
    
my @x = (1..10);
...

OUTPUT: 
101 102 103 104 105 106 107 108 109 110
  3. or download this
     map {$_ += 100} @x;

(yields same output and alters @x as does...)
...
in case you wondered... :)