matching.kt

class Person(val isClever: Boolean)

val p = Person(isClever = true)

// ERROR - missed "false"
val example1 = when (p.isClever) {
    true -> "Yes, this person is clever"    
}

// No error - all cases matched
val example2 = when (p.isClever) {
    true -> "Yes, this person is clever"
    false -> "Fully matched!"
}

// ERROR - even though all cases are "theoretically" matched
// replace "number <= 10" with "else" to get it to compile
val example3 = run {
    val number = 10
    when (p.isClever) {
        true -> "Yes, this person is clever"
        // here is how you structure it 
        false -> when {
            number > 10 -> "Clever when number is more than 10"
            number <= 10 -> "Clever when number is not more than 10"
        } 
    }
}