function familySeats(row, reserved) {

    const rowsOfSeats = [];
    let reservedSeats = reserved.split(" ");
    let noOfThreeSeatsAvailable = 0;


    for (let i = 1; i < row + 1; i++) {
        rowsOfSeats.push([i + "A", i + "B", i + "C", i + "D", i + "E", i + "F", i + "G", i + "H", i + "J", i + "K"])
    }

        //loop the rows
        for (let i = 0; i < rowsOfSeats.length; i++) {//calculate the

            let seat = rowsOfSeats[i];

            //loop seats backwards because splice function removes elements.
            //If you loop forwards it will skips elements due to the seat array being transformed by splice.
            for (var j = seat.length - 1; j >= 0; j--) {

                //loop reservedSeats
                for (let k = 0; k < reservedSeats.length; k++) {

                    //Remove reserved seats from available seats array
                    if (seat[j] === reservedSeats[k]) {
                        rowsOfSeats[i].splice(j, 1);
                    }
                }
            }
        }

    for (let i = 0; i < rowsOfSeats.length; i++){
        let rowNumber = i + 1;
        if (rowsOfSeats[i].includes(rowNumber + "A") && rowsOfSeats[i].includes(rowNumber + "B") && rowsOfSeats[i].includes(rowNumber + "C")) noOfThreeSeatsAvailable ++;
        if (rowsOfSeats[i].includes(rowNumber + "D") && rowsOfSeats[i].includes(rowNumber + "E") && rowsOfSeats[i].includes(rowNumber + "F") ||
            (rowsOfSeats[i].includes(rowNumber + "E") && rowsOfSeats[i].includes(rowNumber + "F") && rowsOfSeats[i].includes(rowNumber + "G"))) noOfThreeSeatsAvailable ++;
        if (rowsOfSeats[i].includes(rowNumber + "H") && rowsOfSeats[i].includes(rowNumber + "J") && rowsOfSeats[i].includes(rowNumber + "K")) noOfThreeSeatsAvailable ++;
    }

    console.log(noOfThreeSeatsAvailable);
    return noOfThreeSeatsAvailable;

}

familySeats(2, "1A");