2013-10-02 21:51:19 GMT
Some of you will know that I’ve promised to give a talk about Edward’s lens library at the Haskell Exchange in London next Wednesday (9th). I did this to give everyone (including me) a break from GHC hackery, and also to force me to learn about this lens voodoo that everyone is twittering about. Edward generously gave me quite a bit of one-to-one attention last week (my hair is still standing on end), but this message is to ask your help too.
Specifically, I’d like to give some compelling use-cases. If you are using the lens library yourself, could you spare a few minutes to tell me how you are using it? I expect to cover Lens and Traversal but not Prism.
The use-case everyone starts with is nested records, but I’d like to go beyond that. The next levels seem to be:
· Lenses as views of data that isn’t “really there” e.g. regarding a record with rectangular coordinates as having polar coordinates too.
· Lenses and Traversals that focus on elements of finite maps (Control.Lens.At)
What else? I’m sure you are using them in all sorts of cool ways that I would never think of, and I’d love to know.
Please don’t tell me anything secret!
And don’t burn too many cycles on this...I don’t want to waste your time, and I can always get back to you if I can’t understand what you say. Sooner is better than later...Weds is coming.
Simon “Edward’s prophet” PJ
_______________________________________________ Libraries mailing list Libraries <at> haskell.org http://www.haskell.org/mailman/listinfo/libraries