There's an error in either the instructions or the random guesses: some of the guesses can indeed be empty strings.
@Elostier Works in the JS version. I haven't tried the Python translation.
Except that knock.toString() doesn't work, neither does console.log(knock.toString()) :\
knock.toString() yields the response "Test didn't pass: Unknown error." Are you saying that's supossed to reveal something?
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CoffeeScript and Ruby translations kumited.