Completely agree to this! One very rarely comes across a completely self contained piece of code such as sorting or searching. The code you are reading or explo

Completely agree to this! One very rarely comes across a completely self contained piece of code such as sorting or searching. The code you are reading or exploring is usually a piece of a larger scheme of things; held together by scaffolding so to say. And unless one actually runs the system (not just that specific code) end to end it's really difficult to understand. I've also found it very useful to slightly modify the code and compare my expectation with the actual result of a test run.