Debugging and Profiling
"If debugging is the process of removing software bugs, then programming must be the process of putting them in."– Edsger W. Dijkstra
In the life of a professional coder, debugging and troubleshooting take up a significant amount of time. Even if you work on the most beautiful code base ever written by a human, there will still be bugs in it; that is guaranteed. We spend an awful lot of time reading other people's code and, in our opinion, a good software developer is someone who keeps an eye out for potential bugs, even when they're reading code that is not reported to be wrong or buggy.
Being able to debug code efficiently and quickly is a skill that every coder needs to keep improving. Like testing, debugging is a skill that is best learned through experience. There are guidelines you can follow, but there is no magic book that will teach you everything you need to know in order to become good at this.
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