Hi, you should avoid using global/shared variables as your function has side effects using it.

Hello everyone, I'm new here and this is my first Kata. Can someone please explain to me what is going on. I just finished up the code and was excited when all of the tests passed then this happened.

Basic tests
Test Passed: Value == wording, words, wordy, wordz
Test Passed: Value == ha, he, hi, ho
Test Passed: Value == a, ba, cat, wax, yellow, zephyr
Test Passed: Value == today, are, doing, hello, you, how
Test Passed: Value == wording, words, wordy, wordz
Test Passed: Value == ha, he, hi, ho
Test Passed: Value == a, ba, cat, wax, yellow, zephyr
Test Passed: Value == today, are, doing, hello, you, how
Random tests
Testing for "August Samuel Wahlen, Paul von Oberstein, Emil von Secla, Karl Robert Steinmetz, Fritz Josef Bittenfeld, Ernst von Eisenach, Arthur von Streit", 10
TypeError: Object function {
var i = this.length,
j,
k;
for {
j = Math.floor(Math.random() * this.length);
k = this[--i];this[i] = this[j];this[j] = k;
}
return this;
} has no method 'substring'
at sortIt
at Object.Test.it
at Object.Test.describe

    at Object.<anonymous>

8 Passed
0 Failed
40 Errors
Process took 81ms to complete

I'm really confused. None of this code is even anything I wrote. How do I get a typeError for something I never put in there. I'm sure there is a simple explanation I hope that someone can explain to me whats happening. Thank You