What was first Kotlin or Swift?

Though the basic declaration of classes and functions in Kotlin and Swift is almost the same , there are some contrasting differences. The Kotlin classes, functions, and properties defined above are final by default. This means they can’t be inherited.6 May 2020

With Kotlin Multiplatform, you can create different multiplatform projects for multiple platforms, including web, desktop, and other native platforms. Kotlin applications will work on different operating systems, such as macOS, Windows, Linux, Android, iOS, watchOS, and others .

Swift took language ideas “from Objective-C, Rust, Haskell, Ruby, Python, C#, CLU, and far too many others to list”. So, Kotlin development started before Swift .

A couple of differences between Swift and Kotlin is that Kotlin allows you to provide default functionality for a method, while Swift requires an extension of the protocol in order to give an implementation . Another is for generics.