For the specific case of traversing objects (well, let's say data types), I think Haskell's lens library is the ultimate modern example. In fact, I think it basically covers everything he asked for in that section and more. It's quite a large library, for better or worse, so it really is complete.
People have called it a "jQuery for data types", and that isn't such a bad description. It allows you to uniformly interact with nested records (similar to objects), collections and variants (values chosen from a known set of possibilities--sum types).
It's systematic, modular and surprisingly powerful. Of course, like many powerful abstractions--including Haskell itself--it takes a bit of up-front effort to learn, but it's more than worth it.
People have called it a "jQuery for data types", and that isn't such a bad description. It allows you to uniformly interact with nested records (similar to objects), collections and variants (values chosen from a known set of possibilities--sum types).
It's systematic, modular and surprisingly powerful. Of course, like many powerful abstractions--including Haskell itself--it takes a bit of up-front effort to learn, but it's more than worth it.