CODE EXAMPLE FOR JAVASCRIPT

add function

input.addEventListener('change', () => {
  const num = parseFloat(input.value);
  if (isNaN(num)) {
    para.textContent = 'You need to enter a number!';
  } else {
    para.textContent = `${num} squared is ${squared(num)}. `;
    para.textContent += `${num} cubed is ${cubed(num)}. `;
    para.textContent += `${num} factorial is ${factorial(num)}. `;
  }
});