Associative Arrays 03. Piccolo

function piccolo(arr) {
    let cars = [];

    for (let carDetails of arr) {
        let [direction, number] = carDetails.split(', ');
        if (direction === 'IN') {
            if (!cars.includes(number)) {
                cars.push(number);
            }
        } else if (direction === 'OUT') {
            if (cars.includes(number)) {
                let index = cars.indexOf(number);
                cars.splice(index, 1);
            }
        }
    }

    if (cars.length > 0) {
        let sorted = cars.sort((a, b) => a.localeCompare(b));
        for (let carNum of sorted) {
            console.log(carNum);
        }
    } else {
        console.log('Parking Lot is Empty');
    }

}