See ‘How you study’ to find out more. It’s no surprise JavaScript continues to be a top language, as it powers the web applications we use every day. What’s impressive is the constant improvements to JavaScript that enable developers to continue to innovate and thrive in the web application world. All major front-end frameworks are written in JavaScript or a language that produces JavaScript to run. Usage of frameworks like Backbones.js are declining and being replaced by UI work done directly in Angular, React and Vue, while emerging tools.