calc(1)(2)(3)() = 6, calc(1)(1)(1)(1)() = 4, calc(a)(b)(c)...(z) = a + b + c + ... + z, find the calc function. Guys, let me know your solution.

calc.html

<script>
var calc = function () {
  var value = (this instanceof Number ? +this : 0);
  if (!arguments.length) return value;
  return calc.bind(arguments[0] + value);
}
console.log(calc(1)(8)(3)(99)());

</script>