Apply Discount Every n Orders LeetCode solution in JavaScript

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var Cashier = function (n, discount, products, prices) {
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  this.n = n;
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  this.cc = 0;
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  this.discount = (100 - discount) / 100;
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  this.products = new Map();
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  const len = products.length;
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  for (let i = 0; i < len; i++) {
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    this.products.set(products[i], prices[i]);
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  }
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};
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Cashier.prototype.getBill = function (product, amount) {
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  let total = 0,
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    len = product.length;
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  for (let i = 0; i < len; i++) {
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    total += amount[i] * this.products.get(product[i]);
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  }
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  this.cc++;
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  if (this.cc % this.n == 0) {
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    total = total * this.discount;
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    this.cc = 0;
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  }
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  return total;
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};