kotlin mapコレクション- map ()メソッド

1. fun <K, V, R> Map<out K, V>.map(transform: (Map.Entry<K, V>) -> R): List<R>
2. fun <K, V, R : Any> Map<out K, V>.mapNotNull(transform: (Map.Entry<K, V>) -> R?): List<R>
3. fun <K, V, R, C : MutableCollection<in R>> Map<out K, V>.mapTo(destination: C, transform: (Map.Entry<K, V>) -> R): C
4. fun <K, V, R : Any, C : MutableCollection<in R>> Map<out K, V>.mapNotNullTo(destination: C, transform: (Map.Entry<K, V>) -> R?): C
5. fun <K, V, R> Map<out K, V>.mapKeys(transform: (Map.Entry<K, V>) -> R): Map<R, V>
6. fun <K, V, R> Map<out K, V>.mapKeys(transform: (Map.Entry<K, V>) -> R): Map<R, V>
7. fun <K, V, R> Map<out K, V>.mapValues(transform: (Map.Entry<K, V>) -> R): Map<K, R>
8. fun <K, V, R, M : MutableMap<in K, in R>> Map<out K, V>.mapValuesTo(destination: M, transform: (Map.Entry<K, V>) -> R): M 

data class Address(
    val street: String,
    val postcode: String
)
 
data class Customer(
    val firstName: String,
    val lastName: String,
    val age: Int
)

data class Person(
    val fullname: String,
    val age: Int,
    val address: Address
)

val customerMap = mapOf(Pair(Customer("Jack", "Davis", 25), Address("NANTERRE CT", "77471")),
                        Pair(Customer("Mary", "Taylor", 37), Address("W NORMA ST", "77009")),
                        Pair(Customer("Peter", "Thomas",17), Address("S NUGENT AVE", "77571")),
                        Pair(Customer("Amos", "Nelson",23), Address("E NAVAHO TRL", "77449")),
                        Pair(Customer("Craig", "White",45), Address("AVE N", "77587")),
                        Pair(Customer("Laura", "Lewis", 32), Address("NANTERRE CT", "77471")),
                        Pair(Customer("Steven", "Harris", 39), Address("S NUGENT AVE", "77571")),
                        Pair(Customer("Paul", "Moore", 18), Address("E NAVAHO TRL", "77449")),
                        Pair(Customer("Mary", "Cook", 61), Address("S NUGENT AVE", "77571")),
                        Pair(null, null))