Great question - After a long day at work I try to stay away from all work related projects. The best coding I do to "relax" would be studying new languages, theories, and concepts. I picked up a book on Machine Learning last month and have been engrossed in that, and have also been learning Python on the side (I mostly work in C# and JS frameworks at work). I think getting out of the comfort zone is really important for developers to hone in new schools, expand their knowledge, and also it doesn't feel like work.
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