[woah]

I bet the person who maintained your code felt lost and stupid though! The benefit of libraries is that the reference exists at all.

[psyklic]

You assume that all libraries are bug-free and documented accurately! I assure you that few are.

[collyw]

That depends. Use a well known library in Python or Perl, and they usually are well documented and tested.

Now choose some obscure JavaScript library from Joe Random on github, and what you say is probably true.