One of my favorite subs:
sub map_pairs(&@) {
my $f = shift;
my @res;
no strict 'refs';
no warnings 'once';
my $caller = caller;
local(*{$caller."::a"}) = \my $a;
local(*{$caller."::b"}) = \my $b;
push @res, $f->($a,$b) while ($a, $b) = splice @_, 0, 2;
return @res;
}
gives:
map_pairs { $a } qw/a b c d/; # ac
map_pairs { $b } qw/a b c d/; # bd
map_pairs { uc($a),lc($b) } qw/a b c d/; # AbCd
But, yes, this very much crosses the line out of "one-liner" land
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