JSFiddle - React, Tailwind, and code Playground

HTML

<select id="mySelect">
  
</select>

JavaScript

var myOptions = {
    val1 : 'text1',
    val2 : 'text2'
};
var mySelect = $('#mySelect');
$.each(myOptions, function(val, text) {
    mySelect.append(
        $('<option></option>').val(val).html(text)
    );
});
mySelect.append('<option value=' + myOptions.length + ' selected>default</option>');