I decided to change the title of this blog to "The Pessimistic Programmer". Why? Am I a depressed person that thinks nothing will work? No, I am an optimist in life. Something good is going to happen today :-) But in programming, something will surely go wrong.
I don't actually view this as pessimism, but as realism. I want to be prepared for the worst that can possibly happen. Hope for the best, prepare for the worst. But my wife explained to me that pessimists always say that they are just being realistic. So, I might as well face it: I am a pessimist.
I think a good programmer needs to be pessimistic; always thinking about what can go wrong and how to prevent it. I don't say that I am a good programmer myself. No, I make far too many mistakes for that. But I have learnt how to manage my mistakes with testing and double checking.
Über-programmers can manage well without being pessimistic. They have total overview of the code and all consequences of changes. But I'm talking about us mere mortals. But if you are an über-programmer, you should be pessimistic about what the next guy will do to your code. Place some comments and unit tests in there, to keep him out of trouble!
An optimistic programmer doesn't see the need for unit tests. He will run the program and be satisfied when it runs one time without errors. He will say things like "What can possibly go wrong?" Or if something goes wrong anyway, "It must be an error in the input from that other module".
Haven't we all been there? Suddenly, I feel so old...