Comments by "p11" (@porky1118) on "Bad Code vs Good Code" video.

  1. 10:00 You COULD write your code in some way that it's easy to change, which would be hard otherwise. For example if you wrote a game, where some subsystem are 3D (Rendering) and some are 2D (physics, UI), and then you decide to change the dimension of one subsystem (physics), it might be very easy or very difficult, depending on how you wrote it. In the simplest case you would have to change a 2 to a 3 at one place. But in the worst case, you have to change ONLY the types, which are related to physics into their 3D equivalents. In 2D you just used a float to represent rotation, while in 3D it would have to be a quaternion. You have to rewrite most of the algorithms, since you didn't use algorithms based on dimension generic operations (like the dot product), but instead you used dimension specific operations (like accessing x and y of the vector). Or if you convert from 3D to 2D, you would probably have used Vectors for rotation speed, which would be scalars in 2D. So you don't immediately know which vectors have to be changed into floats and which would be 2D vectors insdead.
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  2. 55:55 I only use tests for small libraries. For example I wrote tests for some collision detection library to have at least one edge case. It was a capsule collission detection library. So I checkked collissions between every possible tuple of these components: - point (capsule of radius 0, where both ends are at the same point) - sphere (capsule of radius greater 0, where both ends are at the same point) - cylindrical part (a real capsule will be touched at its cylindrical part) - spherical part (a real capsule will be touched at its spherical part) And I had collissions for the most common dimensions (2D and 3D). Technically works in other dimensions, too.
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  3. 7:00 There is code, which doesn't need to change. Maybe some very specific task, which you put into a library. If you want to change the library, and it's not an easy change, it might be because you do something totally different, and so you probably want a different library.
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