my @list_in_html =
  map_by_index [ sub { "<li>$_</li>" },
    last => sub { qq!<li class="last">$_</li>! }, ], @list;

my @list_in_html =
  map_by_index [ sub { "<li>$_</li>" },
    $#list => sub { qq!<li class="last">$_</li>! }, ], @list;


##</code><code>##

my @list_in_html = maplist(
    [
        ( sub { "<li>$_</li>" } ) x ( @list - 1 ),
        sub { qq!<li class="last">$_</li>! },
    ],
    @list
);