text: // data-transformation.js
  const original = ["medellin", "bogotá", "cali", "barranquilla"];
  
  const capitilized = original.map((item) => item.toUpperCase());
  const filtered = original.filter((item) => item.substr(0, 1) < "c");
  const cities = original.reduce((item, acc) => item + acc + ", ", "");
  
  console.log("Capitalized:", capitilized);
  console.log("Filtered:", filtered);
  console.log("Cities:", cities);
  console.log("Original:", original);
  