//get values from the page
function getValues(){
    //get values from the page
    let startValue = document.getElementById("startValue").value;
    let endValue = document.getElementById("endValue").value;


    //parse into Integers
    startValue = parseInt(startValue);
    endValue = parseInt(endValue);

    if (Number.isInteger(startValue) && Number.isInteger(endValue)) {

        //we call generateNumbers
        let numbers = generateNumbers(startValue, endValue);

        //we call displayNumbers
        displayNumbers(numbers);

    }else{
        alert("You must enter integers");
    }
}

//generate numbers from the startValue to the endValue
//logic function(s)

function generateNumbers(sValue, eValue){
    let numbers = [];

    //we want to get all numbers from start to end
    for(let index = sValue; index <= eValue; index ++){
        numbers.push(index)
    }
    return numbers;
}

//display numbers and mark the even numbers bold
//display or view functions
function displayNumbers(numbers){

    let templateRows = "";

    for (let index = 0; index < numbers.length; index++) {

        let className = "even";
        let number = numbers[index];

        if(number % 2 == 0){
            className = "even";
        }
        else{
            className = "odd";
        }

        //This does not render correctly with prism
        templateRows += `${number}`;
    }

    document.getElementById("results").innerHTML = templateRows;
}

The code is structed in one funtion.

Hello World

Hello World is a function that displays an alert with a message of "Hello World"