JSFiddle - React, Tailwind, and code Playground

HTML

<select id="inputRoom">
 
    <option value="0" selected></option>
    <option value="1">1</option>
    <option value="2" >3</option>
    <option value="3">3</option>    
</select>

JavaScript

$(function(){    
  
   if (($("#inputRoom").val()=="") ||($("#inputRoom").val()=="0") )
   {
       $('#inputRoom option').eq(1).attr('selected', 'selected');
   }       
});