[weiming]

Is there any data on Swift adoption among the popular apps/companies? E.g. last I remember hearing, Facebook was still on ObjC/C++, but Uber has gone all in.

One use at Google is internal tools according to this post: https://news.ycombinator.com/item?id=15701107

[foobarbazetc]

We’re medium sized and our iOS app is something like 200k+ LOC of Objective-C. We started our rewrite (where we replace each .m with a .swift) when 4.0 became available.

It’s been nice because Obj-C is a terrible language, but the worst thing about Swift (so far) is value types for collections. Just a terrible idea with no real benefit as far as I can see (someone will say COW something something concurrency something. But nothing concurrent is provided and all the code out there is just giant locks on base collection types. java.util.concurrent.* is unmatched)