Add Scaladoc for Zipper.

[vil1]

Hi, coming there from codetriage.

IMO, what's missing is a proper introduction on what a Zipper makes possible, attached as a scaladoc comment on the Zipper class.

It would need to provide examples of Zipper usage in the same way, eg, the scaladoc for Generic does (@milessabin, please correct me if it's not what you had in mind).

A few more information to help people fixing this issue :

• the shapeless Zipper definition is here
• a valuable source of inspiration about zippers in general can be found on wikipedia
• as always, the tests are a good source of inspiration too.

[lemastero]

There are a couple of nice presentations:

• Zippers by Example - George Wilson (youtube)
• Zippers, Comonads & Data Structures in Scala - Mark Hibberd & Tony Morris (youtube)

There are many blogposts about Zippers:

• Learning Scalaz
• Haskell Wiki
• LYAHFGG
• Pavel Panchekha
• Conal Elliot

I could digest this and cast it in the context of Shapeless, but It would not happen fast.

[kazchimo]

If anyone dosen't do this issue, can I take this?

It would be difficult to add Scaladoc as a full tutorial of Zipper because it has lots of operation. So the test cases bellow look suited for the doc of usual cases.

• testTraversal
• testUpdate

Does anybody have the idea for the good Zipper docs?