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my $sum = sub { (map {splice @_, 0, 2, $_[0] + ($_[1] // 0)} @_)[-1] }
+->(@list);

my $sum = sub { (map {splice @_, 0, 2, $_[0] + ($_[1] // 0)} @_)[-1] }
+->(0, @list);

my $sum = reduce { $a + $b } 0, @list;