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 help

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.