using With Kotlin function

.kt

data class User(
  val firstName:String,
  val lastName:String,
  val address:Address
)
// using `with` function
val user = User()
with(user) {
  println(firstName)
  println(lastName)
  println(address)
}

// not using `with` function
val user = User()
println(user.firstName)
println(user.lastName)
println(user.address)