dataClass
copy()
data class User(val name: String, val phone: String){
}
val user1 = User("ingkells","galaxy")
val user2 = user1.copy(phone = "iphone") // name๋ง ๋ณ๊ฒฝํ๊ณ ์ ํ ๋
println(user1.toString())
println(user2.toString())User(name=ingkells, phone=galaxy)
User(name=ingkells, phone=iphone)๊ฐ์ฒด destructuring
val (name, phone) = user1
val (_, phone) = user2destructuring ์์ ์ฝ๋
componentN()
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