Same fringe: Difference between revisions
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{{Works with|Rakudo|#67 ("Bicycle")}}
Unlike in Perl 5, where <tt>=></tt> is just a synonym for comma, in Perl 6 it creates a true Pair object. So here we use Pair objects for our "cons" cells, just as if we were doing this in Lisp. We use the <tt>gather/take</tt> construct to harvest the leaves lazily as the elements are visited with a standard recursive algorithm, using multiple dispatch to differentiate nodes from leaves. The <tt>eqv</tt> value equivalence is applied to the two lists in parallel.
<lang perl6>sub
multi sub fringey (Pair $node) { fringey $_ for $node.kv; }
multi sub fringey ( Any $leaf) { take $leaf; }
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