Classes drive me crazy. That might seem strange, so let me explain why.
Clearly classes should be great. Our brain excels at classifying everything around us. So it seems natural to classify everything in OO programs too.
However, in the real world, there are only objects. Classes exist only in our minds. Can you give me a single real-world example of class that is a true, physical entity? No, I didn’t think so.
Now, here’s the problem. Have you ever considered why it is so much harder to understand OO programs than procedural ones?
Well, in procedural programs procedures call other procedures. Procedural source code shows us … procedures calling other procedures. That’s nice and easy, isn’t it?
In OO programs, objects send messages to other objects. OO source code shows us … classes inheriting from classes. Oops. There is a complete disconnect in OOP between the source code and the runtime entities. Our tools don’t help us because our IDEs show us classes, not objects.
I think that’s probably why Smalltalkers like to program in the debugger. The debugger lets us get our hands on the running objects and program them directly.
Here is my message for tool designers: please give us an IDE that shows us objects instead of classes!
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