how to make a search dropdown code example

Example 1: searchable dropdown bootstrap

<select class="selectpicker" data-live-search="true">
  <option data-tokens="ketchup mustard">Hot Dog, Fries and a Soda</option>
  <option data-tokens="mustard">Burger, Shake and a Smile</option>
  <option data-tokens="frosting">Sugar, Spice and all things nice</option>
</select>

Example 2: seach with dropdown list

<!-- Script -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src='select2/dist/js/select2.min.js' type='text/javascript'></script>

<!-- CSS -->
<link href='select2/dist/css/select2.min.css' rel='stylesheet' type='text/css'>