Ironically, I suspect that a better example of a problem that's easier to solve with mutation than with a pure functional interface would be graph reduction, wh

Ironically, I suspect that a better example of a problem that's easier to solve with mutation than with a pure functional interface would be graph reduction, which is a technique for evaluating purely functional languages. http://en.wikipedia.org/wiki/Graph_reduction http://en.wikipedia.org/wiki/Graph_reduction