text: print = console.log;
  const cart = [ {name: 'Widget', price: 9.95}, 
      {name: 'Gadget', price: 22.95}];
  const names = cart.map(x => x.name);
  const prices = cart.map(x => x.price);
  const discountPrices = prices.map(x => x * 0.8);
  print(names);
  print(prices);
  print(discountPrices);
  const lcNames = names.map(x => x.toLowerCase());
  print(String.prototype.toLowerCase.apply("ABC"));
  print(lcNames);
  