I was in a line once at WWDC in 2011. I happened to be in front of a group of Apple engineers. I overheard them discussing a rumored functional-ish language tha

I was in a line once at WWDC in 2011. I happened to be in front of a group of Apple engineers. I overheard them discussing a rumored functional-ish language that Apple was to switch to from Obj-C. They didn't know what it was but they seemed skeptical that it would ever be put into real use. Glad to see it only took 11 years for it to permeate down to the Foundation framework. :)