ticketStealing.js

// You're hosting an event, and the admission tickets are expensive. Groups of people are trying to cheat the system by using the same tickets multiple times. Stop them!

// 1) Create a constructor function called Ticket that takes one parameter, code, and creates a Ticket object. 
// The Ticket object will have the following parameters:
//   code : a string that stores the ticket code
//   used : a boolean that stores whether or not the ticket has been used yet
//   useTicket: a function registers that the ticket has been used and prevents reuse or tampering

// 2) Create a function called validTicket to check whether the ticket is valid and return true or false. For a ticket to be valid, 
// the ticket code must match the correct code, and the ticket must be unused.

function Ticket(code){
  this.code = code;
  this.used = false;
  this.useTicket = function(){
    this.used = true;
    Object.freeze(this);
  }
}

function validTicket(ticket, correctCode){
  return !ticket.used && ticket.code == correctCode;
}