digital-ocean-billing-history-calc.js

(function () {
  var accumulator = 0;

  $('.Billing--history tr td').map(function (i, el) {
    var text = el.innerText.trim();
    var r = /^-\$?[0-9]+(\.[0-9][0-9])?$/;

    var number;
    if (text) {
      number = text.match(r);
      if (number) {
        number = number[0];

        if (number[0] === "-") {
          number = number.slice(1);
        }

        if (number[0] === "$") {
          number = number.slice(1);
        }

        accumulator += parseFloat(number);
        console.log(accumulator);

      }
    }


  });
  
  console.log("final result: ", accumulator);
})();