Apple's programming language Swift is less than four years old, but a new report finds that it's already as popular as its predecessor, Apple's more established Objective-C language. Swift is now tied with Objective-C at number 10 in the rankings conducted by analyst firm RedMonk. It's hardly a surprise that programmers are interested in Apple's language, which can be used to build applications for the iPhone, Apple Watch, Macintosh computers, and even web applications.