Justin Weiss:
When you want to go beyond the documentation and see real-world uses of a library or feature, use GitHub’s code search.
For example, say I just read the Rails guide on Conditional GET Support. I feel like I understand it, but I want to see some more examples before I use it for real.
I could hop onto GitHub search, and look for "if stale?":
Why I never think of this before? Nice trick.