Kotlin is in the winning camp

The features of Kotlin have a good validation when one considers that other languages, which have similar features, are also growing in popularity:

• The Crystal language attracts Ruby programmers by adding static typing support. Similarly, TypeScript adds static typing support to JavaScript and has become the preferred language for some JavaScript frameworks.
• Scala and F# add functional programming support to traditional non-functional paradigms without sacrificing type safety and, hence, are more attractive. Kotlin uses functional programming, just enough to ease out the programming in a lot of cases, but not too much to make it complex.
• Like Kotlin, Swift, and Rust also have inbuilt null-safety. Kotlin and Swift are often compared, as their syntaxes resemble one another a lot.
• Server-side languages, which were getting designed after the emergence of the parallel computing phenomena, became one of the chief requirements for providing inbuilt constructs for easing the programmer's work. One can find this in both Kotlin (coroutines) and Rust.