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How i can i get better and see errors in a source code because as is now i dont understand this level because i dont see the problem with java i really want to learn this stuff because i love learning new things can someone help me plz.
You are looking at the right section of the code but thats not java, that is javascript and answer also lies in that code. You can learn javascript from w3schools or tutorialspoint which will help you to understand such type of code.