Our Solution
We arrived at a test-driven solution for Soundex. Our solution is by no means the only one or even the best. But we have high confidence that we could ship it (barring the outstanding items discussed in What Tests Are We Missing?), and that’s what’s most important.
I’ve test-driven Soundex a handful of times, each time deriving a different solution. Most solutions differed only in a few small ways, but one was dramatically different (and poorly performing) when I actively sought to solve the problem in an extremely declarative manner. Each pass through the process of test-driving Soundex taught me a bit more about the algorithm, but I also learned more about what works well from a test-driving stance.
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