Disable some options in dropdownlist with jquery

Introduction:
This article explains how disable some options in dropdownlist with jquery.

HTML:

<select>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

JQuery:

 

$("select option").each(function() {
    var $thisOption = $(this);
    var valueToCompare = "saab";

    if($thisOption.val() == valueToCompare) {
        $thisOption.attr("disabled", "disabled");
    }
});

OUTPUT: