///INITIATION:
              
              //Program Entry points
              function getValues2() {
              let startValue = document.getElementById("startValue").value;
              let endValue = document.getElementById("endValue").value;

              //VALIDATION:
              startValue = parseInt(startValue);
              endValue = parseInt(endValue);

              //check to see if input is integer
              if (Number.isInteger(startValue) && Number.isInteger(endValue)) {
              //generate list of numbers
              let numbers = generateNumbers(startValue, endValue);
              displayNumbers(numbers);
              } else {
              Swal.fire({
              icon: "error",
              title: "oops",
              text: "only integers are allowed for JS Speedway"
              })
              }
              }
              //LOGIC:
              function generateNumbers(start, end) {
              let numbers = [];
              for (let index = start; index <= end; index++) { 
                numbers.push(index); 
              } 
              return numbers; 
            } 
            //DISPLAY:
            function displayNumbers(numbers) { 
              let templateRows="" ; 
              let className="even" ; 
              for (let index=0; index < numbers.length; index++) { 
                  let number=numbers[index]; 
                  if (number % 2===0) { 
                  className="even" ; 
                } else {
                className="odd" ;
               } 
               let row=`${number}`;
                templateRows += row;
                }
                document.getElementById("results").innerHTML = templateRows;
                }
              
            
          

The code is structured in three functions.

.JS Speedway

.JS Speedway is a simple program looping input integers and displaying them to the page. Even numbers are bolded.

Brief code overview:

• Initiation:
  • event listener (located in the bottom <script> tag) is triggered by a "click" on the "submit" button.
  
  
  • Inputs from the two user fields ("Start Value" and "End Value") are passed into the "Get Values" function.
  
  
• Validation:
  • Inputs are checked to make certain they are integers (numbers) and not strings.
  
  
  • If inputs are numbers treated as strings, the program parses them to integers.
  
  
  • If inputs are text, the system will alert the user, "Only integers are allowed for JS Speedway."
  
  
• Logic:

  Within the "Generate Numbers" function, the following processes occur:

  • the "numbers" array is created
  
  
  • the "for" loop passes the start value and increments the number by one.
  
  
  • the produced number is pushed to the "numbers" array.
  
  
  • Meanwhile, produced numbers are re-introduced into the loop until the incremented number is equal to the End Value.
  
  
  • the function returns the "numbers" array.
  
  

• Display:
  • Inside the "for" loop:
  
  
  • A boolean tests each number in the "numbers" array by dividing each number by 2 to determine whether the number is even.
  
  
  • Numbers testing "true" are bolded.
  
  
  • Numbers testing "false" are not bolded.
  
  
  • "Template Rows" variable injects the "Number" variable (from the "Display Numbers" function) into the template literal.
  
  
  • Finally, "Template Rows" are published to the HTML via the "results" class.