The freelance developer placement firm looked at year-on-year growth in job requests for each language and found that requests for Swift projects rose 600% in 2015, roughly triple the rate of many other languages. Requests for HTML jobs grew 267 percent, followed by 244% growth for C++ requests, and 239% growth for CSS. PHP, Sass, Objective-C, Less, XML, and Python recorded growth in a range between 167% and 120%, according to Toptal, which said its data was based on tens of thousands of companies looking for talent.
Swift is the brainchild of Chris Lattner, who is the senior director of Apple's Developer Tools Department. In 2010, he began taking ideas from Objective-C, Rust, Haskell, Ruby, Python, C#, CLU and other languages to create the new language. Swift was first unveiled at Apple’s 2014 Worldwide Developer Conference.
The language is open source under the Apache license, which says that developers can use the software for any purpose and even distribute modified versions of Swift without paying royalties to Apple. It's hoped that developers will begin to use Swift for development outside of the Apple ecosystem.