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Commenting out code is an amazing way to quickly do experiments and figure out which part of your code is to blame. You can:
- comment out a function call and replace it with a hardcoded value, to check if the function call is broken
- if the error message doesn’t give you a line number, comment out huge chunks of the program until the problem goes away
- comment out some code and rewrite it to see if the new version is better
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