JSFiddle - React, Tailwind, and code Playground

HTML

<select id="procDateId" name="procDateId">
     <option value>1/11/2017</option>
     <option value>1/11/2017</option>
     <option value>1/10/2017</option>
     <option value>1/9/2017</option>
    </select>

JavaScript

$(document).ready(function () {

            alert("here you go !!!");

            [].slice.call($('#procDateId option'))
              .map(function (a) {
                  if (this[a.innerText]) {
                     a.remove();
                     } else {
                      this[a.innerText] = 1;
                  }
              }, {});

        });