Loops

const numberOfPassengers = 10;

// Do this X many times
for (let i = 0; i < numberOfPassengers; i++) {
  console.log('Passenger boarded!');
}

// With arrays
const passengers = [
    'Will Alexander',
    'Sarah Kate',
    'Audrey Simon'
]

// for in
for (let i in passengers) {
    console.log('Boarding passenger ' + passengers[i]);
}

// for of
for (let p of passengers) {
  console.log('Boarding passenger ' + p);
}

// while
while (passengers.length > 0) {
  passengersBoarded++;
  passengersUnboarded--;
}