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Re:Ask HN: What are your tips for reading code? by rasengan on Saturday June 22, 2019 @10:03AM (#20249595)
When I want to fully understand others code, I actually comment it, in my own words.

This seems to help me a lot.

Secondly, using an editor with expandos helps. Sometimes it’s better to simply know what a function requires and returns as opposed to reading the inner code of the function when you’re trying to get a full high level view of what the code is doing.