Kotlin List / Array Trial(2022-11-27 수정)

 

 

1. list에서 특정 기준으로 중복된 요소 제거, distinct(), distinctBy()

fun main() {

data class xxx(val title:String, val context:String)

val tiger = xxx("tiger", "strong")
val tiger2 = xxx("tiger", "cute")
val lion = xxx("lion", "forceful")
val lion2 = xxx("lion", "powerful")
val cat = xxx("cat", "cute")

val animals = listOf(tiger,tiger2,lion,lion2,cat)

fun distinct() {
animals.distinctBy { animal -> animal.title }.forEach { println(it) }
}

distinct()

}

 

 

 

2. Foreach를 통한 List element 변경 예제

fun main() {

    data class xxx(val title:String, var context:String)

    val tiger = xxx("tiger", "strong")
    val tiger2 = xxx("tiger", "cute")
    val lion = xxx("lion", "forceful")
    val lion2 = xxx("lion", "powerful")
    val cat = xxx("cat", "cute")

    val animals = listOf(tiger,tiger2,lion,lion2,cat)

    animals.forEach{ if(it.title == "lion") {it.context = "unionLion" } }

}