make test cases from the examples (JS version)

Thanks for your reply.
Since speed is not mentioned in the kata description I did not care about execution time.
It's a 7 kyu kata and it's "fast enough".
This solution is KISS and easy on the eyes though.
One could of course implement faster solutions with "fail fast".

the description should state "without moving the pizza pieces"
otherwise one could double the number of pieces with each cut.
then it is as simple as: two to the power of cuts