HTML input type=“number” still returning a string when accessed from javascript

Answer 1

You can use valueAsNumber (described on that page) to get the actual number value. So your code would then be:

function addNum(n1, n2) {
  return n1 + n2;
}

function addNumAction() {
  var n1 = document.getElementById("num1").valueAsNumber;
  var n2 = document.getElementById("num2").valueAsNumber;

  var sum = addNum(n1, n2);
  window.alert("" + sum);

}