learn_enough_javascript_code_listings/Listing_9.9.js

let Phrase = require("<username>-palindrome");

function palindromeTester() {
  let string = prompt("Please enter a string for palindrome testing:");
  let phrase = new Phrase(string);

  if (phrase.palindrome()) {
    alert(`"${phrase.content}" is a palindrome!`);
  } else {
    alert(`"${phrase.content}" is not a palindrome.`)
  }
}

document.addEventListener("DOMContentLoaded", function() {
  let button = document.querySelector("#palindromeTester");
  button.addEventListener("click", function() {
    palindromeTester();
  });
});