The Code

function getValues() {
    //get values from the page
    let fizzValue = document.getElementById('fizzValue').value;
    let buzzValue = document.getElementById('buzzValue').value;
    let endValue = document.getElementById('stopValue').value;

    //parse the input (string) into numbers
    fizzValue = parseInt(fizzValue);
    buzzValue = parseInt(buzzValue);
    endValue = parseInt(endValue);

    // verify that inputs are numbers
    if (Number.isInteger(fizzValue) && Number.isInteger(buzzValue) && Number.isInteger(endValue)) {
        //IF YES -  generate numbers
        let numbersArray = generateNumbers(fizzValue, buzzValue, endValue);
        //& display on page
        displayNumbers(numbersArray);
    } if (endValue > 5000){
        //IF NO - tell user they goofed
        Swal.fire(
            {
                icon: 'error',
                title: 'You goofed it...',
                text: 'That number is waaaay too high! Please enter a value below 5000 for the stop value.',
            }
        );
    // } else {
    //     //IF NO - tell user they goofed, numbers only
    //     Swal.fire(
    //         {
    //             icon: 'error',
    //             title: 'You goofed it...',
    //             text: 'Only integers are allowed for this input.',
    //         }
    //     );
    // }


}

//generate the numbers within the specified value, stopping at the stop value
function generateNumbers(fizzValue, buzzValue, endValue) {
    let numbers = [];
    let end = endValue;

    for (let value = 1; value <= end; value++) {
        let newValue = value;

        if (value % fizzValue == 0) {
            newValue = 'Fizz'
        }

        if (value % buzzValue == 0) {
            newValue = 'Buzz'
        }

        if (value % buzzValue == 0 && value % fizzValue == 0) {
            newValue = 'FizzBuzz'
        }

        numbers.push(newValue);
    }
    return numbers;

}

//Turns the table appearance into fizz, buzz and fizz buzz
function displayNumbers(numbersArray) {
    let tableBody = document.getElementById('results');

    let tableHtml = "";

    for (let index = 0; index < numbersArray.length; index++) {
        let value = numbersArray[index];
        let className = '';
        if (value == 'Fizz') {
            className = 'fizz';
        }

        if (value == 'Buzz') {
            className = 'buzz';
        }

        if (value == 'FizzBuzz') {
            className = 'fizzbuzz';
        }

        let tableRow = `${value}`;

        tableHtml = tableHtml + tableRow;

        if ((index + 1) % 5 == 0) {
            tableHtml += '';
        }
    }

    tableBody.innerHTML = tableHtml;
        }}