Package objects

Question

What are package objects, not so much the concept but their usage?

I\'ve tried to get an example working and the only form I got to work was as follows:

Answer 1

You could do worse than to go straight to the source. :)

https://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/package.scala

https://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/immutable/package.scala