Which Liferay version introduced the new JavaScript framework "Liferay.js"?

The new JavaScript framework "Liferay.js" was introduced with Liferay 7. This version marked a significant evolution in Liferay’s architecture, incorporating modern web development practices and tools. Liferay.js was designed to enhance the development process by providing a simplified and streamlined approach to building web applications, making it easier for developers to leverage JavaScript in their projects.

Prior to Liferay 7, earlier versions were focused more on servlet-based approaches and did not include this specific framework, which aims to improve the client-side experiences through modularity and reusability. The introduction of Liferay.js reflects the framework's commitment to using more contemporary development paradigms and tools that align with the needs of modern web applications, making it a vital feature of Liferay 7.

In summary, the correct answer underscores Liferay 7's role as a pivotal version that embraced JavaScript for enhanced front-end development, distinguishing it from its predecessors and setting the stage for further advancements in the platform.