HTML5 serves as the best choice for building Web-fronted apps for mobile devices. The apps it renders are fully responsive capable of working smoothly on diverse devices. However, on the downside, the language is still a proposed standard rather than a language. Swift is the latest programming language released by Apple Inc for iOS and Linux. It may soon become the most widely used one for iOS apps, which spells a bright future for developers who hold expertise in it.
You can read more here: https://www.orangemantra.com/blog/6-best-programming-languages-used-for-mobile-app-development/
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