Three years ago, Apple made a move that surprised the developer community. They unveiled Swift as a new programming language during a WWDC14 keynote.
Craig Federighi announcing Swift at Apple WWDC 2014
Almost everybody expected incremental changes and enhancements of the Objective-C language. Instead, Apple decided to create a new programming language from scratch: Swift is free of all the legacy Objective-C has accumulated, yet Swift and Objective-C code are meant to live side-by-side to make the transition easier. And, in less than three years after its public announcement, Swift made it into the top 10 most popular programming languages as reported by the TIOBE Index in March 2017, and was named as the second fastest-growing skill in Q4 2016.
Continue reading on Pluralsight