/**
                            * Get input from the user
                            * Controller Function
                            */ 
                           function getValue(){
                               let userInput = (document.getElementById('userString').value).toString();
                           
                               userInput = stripString(userInput);
                               let reversedInput = reverseString(userInput);
                           
                               displayResults(userInput, reversedInput);
                           }
                           
                           /**
                            * Remove spaces and other special characters
                            * Check to see if string is palindrome
                            * Logic Function
                            */
                           function stripString(string){
                               //return string
                               let newString = '';
                           
                               //list of characters to include in split string
                               let alphabet = 'abcdefghijklmnopqrstuvwxyz';
                           
                               //Setting string to lowercase and removing training whitespace
                               string = string.toLowerCase().trim();
                           
                               //Checks against alphabet to remove any special characters and 
                               //assign them to the new string 
                               for (let index = 0; index < string.length; index++) {
                                   if (alphabet.includes(string[index])){
                                       newString += string[index];
                                   }
                               }
                           
                               return newString;
                           }
                           
                           /**
                            * Loops through original string in decremental order 
                            * adding characters in reverse order
                            */
                           function reverseString(string){
                               let reversedString = "";
                           
                               for (let index = string.length-1; index >= 0; index--) {
                                   reversedString += string[index];        
                               }
                           
                               return reversedString;
                           }
                           
                           /**
                            * Display result to the user
                            * View Function
                            */
                           function displayResults(userInput, reversedInput){
                               if (userInput == reversedInput){
                                   document.getElementById('results').innerHTML = `
 PALINDROME! ${userInput} == ${reversedInput}
`;
                               } else {
                                   document.getElementById('results').innerHTML = `
 Try Again! 
`;
                               }
                           }
                        
                    

Hello World

The code is contained within a function

"helloWorld" is a function that displays an alert