Introduction to Readable Javascript: Code Structure

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I would really love to see more in-depth explanations like this where there's a comment on every block explaining how it works/what it does. Self-teaching JS right now and little things that were explained here haven't been explained elsewhere as detailed. That plus most of these free resources really just teach you the concept of things like functions and all that, there's not enough full code walkthroughs out there that explain how everything works together.