When you write code for a living, mistakes can be expensive. They can create bugs that will crop up in the next version or the version after that, they can cause problems down the line for the end user who can't use the software and worst of all, they can create bugs that you spend longs days (and nights) working to find before the release.
One way of avoiding these mistakes is Test Driven Design - write the test before the code and the bug (if any) is easy to find. And a course in Test Driven Design is not that expensive - and even less so today :)
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