// A nested data class representing an address
data class Address(
val city: String,
val zip: Int
)
// A data class representing a person, containing a nested Address
data class Person(
val name: String,
val age: Int,
val address: Address
)
// Print each person in a formatted line
fun printPersons(people: List<Person>) {
people.forEach { p ->
println("${p.name} | age: ${p.age} | city: ${p.address.city} | zip: ${p.address.zip}")
}
}
// Sort persons by city, then zip, then age
fun sortPersons(people: List<Person>): List<Person> {
return people.sortedWith(
compareBy<Person> { it.address.city }
.thenBy { it.address.zip }
.thenBy { it.age }
)
}
fun main() {
// Sample data
val people = listOf(
Person("Alice", 30, Address("San Francisco", 42100)),
Person("Bob", 40, Address("Austin", 32000)),
Person("Carol", 35, Address("New York City", 42000)),
Person("Dave", 25, Address("Austin", 32000)),
Person("Eve", 28, Address("New York City", 61000))
)
// Perform sorting
val sorted = sortPersons(people)
// Display sorted results
printPersons(sorted)
}
/*
run:
Dave | age: 25 | city: Austin | zip: 32000
Bob | age: 40 | city: Austin | zip: 32000
Carol | age: 35 | city: New York City | zip: 42000
Eve | age: 28 | city: New York City | zip: 61000
Alice | age: 30 | city: San Francisco | zip: 42100
*/
