Node.JS helps in building networked apps using non-blocking IO and has quickly changed into a large ecosystem of tools, libraries, and frameworks. Learning Node is not an option, but a requirement.
It is a new open-source programming language for iOS, OS X, watchOS, and tvOS apps that builds on the best of C and Objective C. It adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun.
It is a general-purpose object-oriented programming language. It is the main programming language used by Apple for OS X and iOS and their respective application programming interfaces (APIs) and remains more popular than Swift.
The Ionic Framework is a complete open-source SDK for hybrid mobile app development. It provides tools and services for hybrid mobile app development using Web technologies like CSS, HTML5, and Saas.