Basic troubleshooting

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When an error occurs

Here are some common mistakes to watch out for:

  • Omitting the semicolon at the end of the statement
  • Trying to use an undeclared variable or function
  • Forgetting to initialize variables
  • Using a single equal sign to check equality
  • Trying to print something that is not a String and forgetting .toString()
  • Missing or misplaced parenthesis or curly brace
  • Trying to access an uninitialized array index or overstepping array boundaries
  • Treating 0-based indexes as if they started on 1
  • Creating never-ending loops