I am agree with you, kotlin is my primary language right now, use in different platform especially i do in android development. Kotlin popular because contribute in Android development and most of android developer migrate java into kotlin language, because the stdlib api make android developer feel comfortable.
When i do in backend there same as java language but with flavor. kotlin have good community not only develop in mobile side but in backend side to. i try ktor.io, spring, micronaut, etc. All is great, especially kotlin make every field as properties, when java doesnt have it automatically.
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