Deep Diving: How to Explore a New Code Base
summary
Shows concrete tactics: use tracepoint API to generate call graphs, open dependency sources with bundler open, run targeted tests or small reproduction scripts, and prefer reading the few files that touch your goal. Claims reading dominates writing (about 95% when joining a new project), gives a real example of fixing an MRI bug with a one-line change, and reports it took about two hours to reproduce, patch and submit — the method works.
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