JSFiddle - React, Tailwind, and code Playground

by Sergei Sokolov

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<input type="text" class="message" />
<br />
<input type="checkbox" value='2990' name='Price' class="priceItem"><br />
<input type="checkbox" value='2990' name='Price' class="priceItem"><br />
<input type="checkbox" value='2990' name='Price' class="priceItem"><br />
<input type="radio" value='1990' name='Price' class="priceItem"><br />

JavaScript

/**
 * для вопроса https://toster.ru/q/659586
 * Корректировка JS кода ( сложение, вычитание )?
 */
function Check() {
  var price = 0;
  var PriceBoxes = $('[name=Price][type=checkbox]:checked');
  if (PriceBoxes.length) price = $.makeArray(PriceBoxes)
    .map(el => +el.value)
    .reduce((p,c) => p+c);
    
  $('.message').val(price);
}

$('[name=Price][type=checkbox]').on('click', Check);