Programmers spend a lot of time changing programs that they, or other programmers, have already written. Up to 90% of their time, in some studies.
Make code easy to change. That means:
- Easy to understand.
- Easy to reuse.
- Easy to test.
Things to do:
- Comments. Explain the patterns you're using, the parameters of your
Subs, what you were thinking when you designed the code, your favorite joke… - DRY.
- Meaningful variable names.
- Good indenting.