The answer
Use search and grep to find where a function is defined, where it is called, and how it connects to the rest of the code. Large codebases are too big to read linearly, so search is essential for navigation.
How to Read Large Open-Source Codebases as a Developer
How do I navigate a large codebase I do not understand?
More FAQs in How to Read Large Open-Source Codebases as a Developer
Start with the README and architecture docs, follow the entry point, pick one feature to trace through the code, read tests for behavior, use search and grep to navigate, and take notes to build a personal map of the codebase.
No. Large codebases are too big to read linearly. Pick one feature, like how require works, and trace it through the codebase. One feature at a time builds real understanding without overwhelming you.
Because tests show how a feature is expected to behave, often more clearly than the implementation. They reveal intent and edge cases, so reading tests alongside the code accelerates your understanding.
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