swift 숫자 문자열과 영단어

https://programmers.co.kr/learn/courses/30/lessons/81301

replacingOccurrences함수는 string의 of를 with로 변경해준다.

import Foundation

func solution(_ s:String) -> Int {
  var string = s
  string = string.replacingOccurrences(of: "zero", with: "0")
  string = string.replacingOccurrences(of: "one", with: "1")
  string = string.replacingOccurrences(of: "two", with: "2")
  string = string.replacingOccurrences(of: "three", with: "3")
  string = string.replacingOccurrences(of: "four", with: "4")
  string = string.replacingOccurrences(of: "five", with: "5")
  string = string.replacingOccurrences(of: "six", with: "6")
  string = string.replacingOccurrences(of: "seven", with: "7")
  string = string.replacingOccurrences(of: "eight", with: "8")
  string = string.replacingOccurrences(of: "nine", with: "9")
    return Int(string) ?? 0
}