for (qw(The quick brown fox)) {
   s/o/u/g;
}

##</code><code>##

for (1..5) {
   $_ = ...;
}

##</code><code>##

for (map "$_", qw(The quick brown fox)) {
   s/o/u/g;
}

##</code><code>##

for (qw(The quick brown fox)) {
   my $s = $_;
   $s =~ s/o/u/g;
}

##</code><code>##

for (qw(The quick brown fox)) {
   for (my $s = $_) {
      s/o/u/g;
   }
}