I’m surely not the only person to think, all week long, that this WWDC marks the end of Apple’s NeXT era and the beginning of the Swift era. The NeXT era began, of course, when Apple acquired NeXT, with its Unix-based operating system, amazing developer tools and frameworks, and its CEO, Steve Jobs. Cocoa was so much better for writing Mac apps than the Mac Toolbox was. The Mac Toolbox had been a