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use strict;
use warnings;
...
    sub { "<li class=\"first\">$_[0]</li>\n" },
    sub { "<li class=\"last\">$_[0]</li>\n" },
    qw( alpha beta gamma delta ));

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print for first_last_map(
    { "<li>$_[0]</li>\n" },
    { "<li class=\"first\">$_[0]</li>\n" },
    { "<li class=\"last\">$_[0]</li>\n" },
    qw( alpha beta gamma delta ));