Explanation on Line 37

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Hi all, I'm trying to understand the solution given by CG. Can someone explain Line 37? why would Index ever be less than 0? Doesn't index starts at 0 and increase after that? Also, why is that needed? (I tried to run it commenting out L37, but it wouldn't). Thanks for the input.

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Thomas

Level 41 , Bayreuth, Germany

18 May 2021, 16:35

indexOf(Object o) returns -1 if o is not in the list https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html#indexOf-java.lang.Object-

ImDevin

Level 15 , Old Town, United States

18 May 2021, 19:16

ok. that makes sense. Thx for the input Thomas! 👍