I believe swift is a good language, however its ecosystem being steered by apple is a massive red flag. It also suffers a bit from being a commercially developed language in that its developers are clearly incentivized to add more features.
Do you have any evidence this is true? Most programming languages are developed either by a company (C#, Java, Swift, Go) or heavily influenced by many companies (Python, JavaScript, C++). Java had been criticized forever (until very recently) for it's slow pace of development and it was 100% controlled by either Sun or Oracle.
Comments like these show just how little developers investigate the reasons why features they personally dislike were introduced to a language.
But that’s OK. They do an amazing job of maintaining backwards compatibility and making things fit in the language well as well as trying to get it right the first time.
Some languages are more willing to remove things that don’t work. Others are willing to have multiple different attempts that all work completely differently every few years.
In many ways that’s just not Java’s style. And that’s OK.
Hardly any better than F#.
Kotlin is especially popular on backend if you can’t jump out of JDK8
F# is functional - by definition not mainstream
Spring supports anything that can bring them support contracts.
Kotlin, popular outside Android?
Reality check over here,
https://spectrum.ieee.org/the-top-programming-languages-2023
You can’t deny Kotlin is bigger lang than F# by any ranking from those popular (Tiobe) to unknown ones and is build on top of much bigger ecosystem (JVM) - that’s IMHO much more important factor for anyone doing commercial projects.
Additionally there is a big incentive to use it over Java (if you are stuck with older JDK) contrary to using F# over C#
Kotlin as a lang is better than C# (which is normal - it’s newer) and has better default IDE (IntelliJ) than anything on the market.
I agree that this is a must-have for idiomatic Swift. It is really hard to write the long-named-functions and get all the variable names correct without reasonable autocomplete.
UI is a different matter. Xcode is still miles ahead in performance tooling.
Emacs + lsp-mode + sourcekit + company-mode etc looks reasonably close to what I get with Rust in Emacs.
If I were doing application development I'd maybe consider Swift.