interview-cake.js

// My cake shop is so popular, I'm adding some tables and hiring wait staff 
// so folks can have a cute sit - down cake - eating experience.

// I have two registers: one for take-out orders, and the other for the 
// other folks eating inside the cafe. All the customer orders get combined into one
// list for the kitchen, where they should be handled first - come, first - served.

// Recently, some customers have been complaining that people who placed
// orders after them are getting their food first.Yikes—that's not good for business!

// To investigate their claims, one afternoon I sat behind the 
// registers with my laptop and recorded:

// The take-out orders as they were entered into the system
// and given to the kitchen. (takeOutOrders)

// The dine-in orders as they were entered into the system
// and given to the kitchen. (dineInOrders)

// Each customer order (from either register) as it was finished
// by the kitchen. (servedOrders)

// Given all three arrays, write a function to check that my service 
// is first - come, first - served.All food should come out in the same
// order customers requested it.

// We'll represent each customer order as a unique integer.

// As an example,

//   Take Out Orders: [1, 3, 5]
//  Dine In Orders: [2, 4, 6]
//   Served Orders: [1, 2, 4, 6, 5, 3]
// would not be first-come, first-served, since order 3 was
// requested before order 5 but order 5 was served first.


// But,

//   Take Out Orders: [17, 8, 24]
//  Dine In Orders: [12, 19, 2]
//   Served Orders: [17, 8, 12, 19, 24, 2]
// would be first-come, first-served.

// Note: Order numbers are arbitrary. They do not have to be in increasing order.