GitHub also notes that Google's Dart programming language and Flutter, for building UIs for iOS and Android apps, are getting significant traction with developers on GitHub.
Dart was the fastest-growing language between 2018 and 2019, with usage up a massive 532 percent. It was followed by the Mozilla-developed Rust, which grew a respectable 235 percent.
Microsoft is experimenting with Rust in its Windows codebase because it was designed to address memory-related security bugs -- the dominant flaw-type in Microsoft software over the past decade.
Other languages making up the top 10 fastest-growing categories are HCL, PowerShell, Apex, Python, Assembly, and Go.