Kotlin set collection deduplication, get element variable set collection, set and list conversion

package set

fun main() {
    val set = setOf("Jason", "Jack", "Jacky", "Jack");
    //set 获取元素
    val element3 = set.elementAt(2)
    val mutableSet = mutableSetOf("Jason", "Jack", "Jacky", "Jack");
    mutableSet += "Jimmy"

    var list = set.toList()
    list += element3
    println(list)
    //数组元素去重
    val single = list.toSet().toList()
    //也可以直接调用 distinct 去重
    val single2 = list.distinct()
    println(single)
    println(single2)
}