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9 Quick Code debugging tips (no matter the language)

9 Quick Code debugging tips (no matter the language)



#1. Understand the problem before you fix it

It is essential to know what is the root cause of the bug you are about to fix.

 

#2. Check for common defects

It is usual to find a defect duplicated again in a similar abstraction.


#3. Refine the test cases that produce the error.

Now is the time to write so unit test if you haven't cover this piece of code properly. And you surely didn't :)

So write a test to reproduce the defect, fix it, verify it's working and keep testing for regressions.


#4. Narrow the suspicious region of the code. / Expand the suspicious region of the code.

Depending on what you are digging for.


#5. Be suspicious of classes and routines that have had defects before.

Related to the first point.


#6. Check code that’s changed recently.

This is very important as some minor thing could have sneaked in.


#7. Set a maximum time for quick and dirty debugging => rewrite the code

We always want to make it fast and unnoticeable but sometimes the digging is prolonged enough to think about rewriting the code then.

 


#8. Change the code only for good reason AND Make one change at a time

Resist the temptation to change this and that just because you are about to fix something really wrong.

These other changes could result in a rollback of the main fix. Never know.


#9. Never debug standing up :)

 Inspired by Code Complete






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