If you look at how most programmers spend their time, you’ll find that writing code is actually quite a small fraction. Some time is spent figuring out what ought to be going on, some time is spent designing, but most time is spent debugging. I’m sure every reader can remember long hours of debugging—often, well into the night. Every programmer can tell a story of a bug that took a whole day (or more) to find. Fixing the bug is usually pretty quick, but finding it is a nightmare. And then, when you do fix a bug, there’s always a chance that another one will appear and that you might not even
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