Is there a way in JavaScript to use document.forms for a select tag get a if else compound condition to work

Question

I know you can use document.forms to check if a radio button or checkbox is checked but I am not sure how you could this for a select since it has multiple options.

This is the code I thought I could use. JavaScript:

var pick_deliv = document.forms[order] 
[pick_deliv].checked;

HTML:

<form>
    <select name="pick_deliv" id="pick_deliv">
    <option value="pick_up">Pick up </option>
    <option value="delivery">Delivery </option> 
    </select>
  </form