Let me introduce you to F# Functional App Development using Xamarin.Forms with the Fabulous project, which brings the Elmish Model-View-Update (MVU) architecture to Xamarin. It is a great way for F# developers to rapidly build mobile applications as you will see in this blog post.
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It's summertime, which for Xamarin developers means new iOS betas to explore and learn. ARKit, which debuted last year in iOS 11, has matured over the past year and in iOS 12 is much more flexible than it was previously.
Although Xamarin technologies are most commonly used to develop mobile applications, Xamarin.Mac makes it easy to use your preferred .NET language to develop desktop Mac apps. There are many C# examples in Xamarin’s mac-samples directory on Github, but it's also easy to use F# to develop desktop Mac apps as well.