JoinedWithSeparator.swift

//: Playground - noun: a place where people can play

import UIKit

struct Mobile {
  let number: String
  let status: String
}


let mobiles = [Mobile(number: "081XXXXXXX", status: "Y"),
               Mobile(number: "082XXXXXXX", status: "Y"),
               Mobile(number: "083XXXXXXX", status: "N"),
               Mobile(number: "084XXXXXXX", status: "Y")]

let mobileNumbers = mobiles.filter { $0.status == "Y"}.map {$0.number }


let string = mobileNumbers.joined(separator: ", ")