Suggest simple libraries to read source code for learning JS

Hey, I am currently learning Javascript as I cannot seem to escape it with the direction in which web dev is going. :)

Please suggest simple Javascript libraries one can read to improve their knowledge of JS and see it in action. The ideal libraries would have a small well commented(optional) codebase(around 1000 LOC or less) which preferably requires little domain knowledge. It need not even be a library, any JS code which covers a good deal of the language would be ideal. It would be great if it covered things like OOPS, callbacks, promises, prototypal inheritance and also some simpler stuff such as passing functions around as arguments, etc.