JSFiddle - React, Tailwind, and code Playground

HTML

<input type="hidden" name="price[1]" value="10">
<input type="hidden" name="price[6]" value="230">
<input type="hidden" name="price[7]" value="40">
<input type="hidden" name="price[10]" value="10">

JavaScript

var a="";
$("input[type=hidden]" ).each(function( index ) {
    a+=($(this).val()) + ",";
   
});
  alert(a);