相关疑难解决方法(0)

我需要合并地图mapA和mapB成对的"名称" - "电话号码"到最终地图中,将重复键的值粘在一起,用逗号分隔.重复值只应添加一次.在语言方法方面,我需要最惯用和最正确的方法.

例如:

val mapA = mapOf("Emergency" to "112", "Fire department" to "101", "Police" to "102")
val mapB = mapOf("Emergency" to "911", "Police" to "102")

最终结果应如下所示:

{"Emergency" to "112, 911", "Fire department" to "101", "Police" to "102"}

这是我的功能:

fun mergePhoneBooks(mapA: Map<String, String>, mapB: Map<String, String>): Map<String, String> {
    val unionList: MutableMap <String, String> = mapA.toMutableMap()
    unionList.forEach { (key, value) -> TODO() } // here's I can't come on with a beatiful solution

    return unionList
}