Code Comment Generator

/**
 * Gets user by id.
 *
 * @param {*} id The unique identifier.
 * @param {Object} [options={}] Configuration options.
 * @returns {*} The user by id.
 */
export async function getUserById(id, options = {}) {
  const res = await fetch(`/api/users/${id}`, options);
  return res.json();
}

/**
 * Checks if it is valid email.
 *
 * @param {*} email The email address.
 * @returns {*} True if it does, otherwise false.
 */
const isValidEmail = (email) => /\S+@\S+\.\S+/.test(email);

class Cart {
  /**
   * Calculates total.
   *
   * @param {number} [taxRate=0.18] The tax rate.
   * @param {*} ...discounts Additional discounts.
   * @returns {*} The result.
   */
  calculateTotal(taxRate = 0.18, ...discounts) {
    return this.items.reduce((sum, item) => sum + item.price, 0) * (1 + taxRate);
  }
}