It doesn't sound like you're looking for "obfuscated" code, which is what the links below show. But rather real code that's more complicated than slide examples.

I would look for random code people wrote, for example on github:

https://github.com/search?utf8=%E2%9C%93&q=sort&repo...

And then just look at the code and try to understand how it works. This result for example seems to implement basic functions and is well commented:

https://github.com/erlide/erlide/blob/6b836bcb0770d23c4471f4...

Hope this helps