Once upon a time, back in June of 2014, Apple released Swift. IBM and Apple announced their joint agreement around mobility one month later in July. And then life seemed to return to normal. While Apple developers and some IBM developers (those working on the 100 MobileFirst apps that IBM committed to delivering on iOS) understood just how useful Swift was, its impact was tempered because it was a client-side iOS-only language.
And then, everything changed. In December 2015, Swift was open-sourced by Apple. At the same time, Swift on Linux was also released after significant efforts during 2015 by Apple and IBM to craft server-side capabilities into Swift.