replacingOccurrences

import Foundation let string = "안-녕하세요" string.replacingOccurrences(of: "-", with: "")

func replacingOccurrences(of target: String, with replacement: String) -> String

func hideName(myName: String) -> String { let secontIndex = myName[myName.index(after: myName.startIndex)] return myName.replacingOccurrences(of: String(secontIndex), with: "*") } hideName(myName: "홍길동") // return : "홍*동"

func hideName(myName: String) -> String { var myName = myName.map { String($0) } myName[1] = "*" return myName.joined() } hideName(myName: "베르나르 베르베르") // return : "베*르나르 베르베르"