JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

  <select class="selectpicker" name="operations" id="operations">
  </select>

JavaScript

var dict = {
  "Add" : '+',
  "Minus" : '-',
  "Multiply" : '*',
  "Divide" : '/',
};



for (let key in dict) {

    let value = dict[key];    
    $('#operations').append('<option value=' + value + '>' + key + '</option>');

}