minMaxDemo2.js

Array.prototype.min = function(propertySelector) { return Math.min(...this.map(propertySelector)) };
Array.prototype.max = function(propertySelector) { return Math.max(...this.map(propertySelector)) };

function minMaxDemo(orders) {
  const minimumQuantity = orders.min(order => order.quantity);
  const maximumQuantity = orders.max(order => order.quantity);

  WriteLine(`Minimum Quantity: ${minimumQuantity}`);
  WriteLine(`Maximum Quantity: ${maximumQuantity}`);
}