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fun main(args : Array<String>){
var 문자열 : String = "일반 문자열";
println (
문자열.추가함수("추가함수")
);
}
// 이미 만들어진 객체에 함수를 추가할 수 있다.
fun String?.추가함수(s : String ) : String{
return "나는 $this 너는 $s";
}
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