js

new Option()
new Option(text)
new Option(text, value)
new Option(text, value, defaultSelected)
new Option(text, value, defaultSelected, selected)

js

/* assuming we have the following HTML
<select id='s'>

</select>
*/

const s = document.getElementById("s");
const options = [Four, Five, Six];

options.forEach((element, key) => {
  s[key] = new Option(element, key);
});

js

/* assuming we have the following HTML
<select id="s">
    <option>First</option>
    <option>Second</option>
    <option>Third</option>
</select>
*/

const s = document.getElementById("s");
const options = ["zero", "one", "two"];

options.forEach((element, key) => {
  if (element === "zero") {
    s[key] = new Option(element, s.options.length, false, false);
  }
  if (element === "one") {
    s[key] = new Option(element, s.options.length, true, false); // Will add the "selected" attribute
  }
  if (element === "two") {
    s[key] = new Option(element, s.options.length, false, true); // Just will be selected in "view"
  }
});

/* Result
<select id="s">
  <option value="0">zero</option>
  <option value="1" selected="">one</option>
  <option value="2">two</option> // User will see this as 'selected'
</select>
*/