kotlin toMutableMapでmapをMutableMapに変換する
環境
Windows10 Home 64bit
Java 19.0.1
Kotlin 1.7.20-release-201
書式
map名.toMutableMap()
mapを「MutableMap」に変換します。
使用例
fun main() {
var m = mapOf("tokyo" to 1, "oosaka" to 2, "yokohama" to 3)
val res = m.toMutableMap()
res.put("fukuoka", 4)
println(res)
println(m)
}
fun main() {
var m = mapOf("tokyo" to 1, "oosaka" to 2, "yokohama" to 3)
val res = m.toMutableMap()
res.put("fukuoka", 4)
println(res)
println(m)
}
fun main() {
var m = mapOf("tokyo" to 1, "oosaka" to 2, "yokohama" to 3)
val res = m.toMutableMap()
res.put("fukuoka", 4)
println(res)
println(m)
}
実行結果
{tokyo=1, oosaka=2, yokohama=3, fukuoka=4}
{tokyo=1, oosaka=2, yokohama=3}