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    String.prototype.toJadenCase = function () { // no argument
      //...
    };
    

    Your method is called like this here: str.toJadenCase() and in Run.js your're calling it like this: str.toJadenCase(str) or like this: String.toJadenCase(str)

    Read this, I hope it helps.

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    Not a kata issue, a problem with your code, use Question label for things like this. You're not using prototype ok, it doesn't use an argument.