Quick and dirty lottery draw

lotto-draw.dart

import 'dart:math';

void main() {
  var tm = new TicketManager();
  tm.buyTicket('WeyLand-Yutani', 50000);
  tm.buyTicket('srolls', 10000);
  
  tm.drawTicket();
}

class TicketManager {
  num curTicket;
  List<Ticket> tickets;
  
  TicketManager() {
    tickets = new List<Ticket>();
    curTicket = 1;
  }
  
  void buyTicket(String name, num quanity) {
    var tick = new Ticket(name, curTicket, curTicket + quanity);
    curTicket += quanity;
    tickets.add(tick);
  }
  
  void drawTicket() {
    var rand = new Random();
  	var myNum = rand.nextInt(curTicket - 1);
    myNum += 1;
    print('Ticket: $myNum');
    var winner = tickets.firstWhere((el) => el.hasTicket(myNum));
    print('Winner: ${winner.name}');
  }
}

class Ticket {
  String name;
  num start;
  num end;
  Ticket(this.name, this.start, this.end);
  
  bool hasTicket(num winner) => start <= winner && winner <= end;
}