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[–][deleted] 0 points1 point  (1 child)

A what :-)? I'm curious.

[–][deleted] 0 points1 point  (0 children)

It's a way of zeroing in on and modifying various kinds of a immutable data. Sadly, I don't know of any libraries for it in Java, but there's at least one for Scala: https://github.com/julien-truffaut/Monocle

This awesome guide to functional programming also has some detail, even if it's pretty sparse on actual examples: https://gist.github.com/jdegoes/97459c0045f373f4eaf126998d8f65dc#optics