Looks like a mildly cleaned up Java, was expecting something a little more interesting. Don't see much in the way of functional programming or worthwhile changes vs Java.<p>Was expecting a Scala competitor, but found a slightly better Java with some syntax sugar. It's "nice", but not really different enough to warrant the effort of switching to another language. As a Java dev for 10+ years Scala was an eye opener on what a language could really be, Kotlin is "nice", but sadly not that interesting.<p>Minor pet peave is they have retained even Java's verbosity for outputting text:<p>Kotlin:
System.out?.println("Hi")
Java:
System.out.println("Hi")
Scala:
println("Hi")
Ruby:
puts("Hi")