Jaki będzie result? Które metody tablicowe są kluczowe w FP i dlaczego?

const users = [
  { name: "Alice", age: 30 },
  { name: "Bob", age: 25 },
  { name: "Charlie", age: 35 },
];

const result = users
  .filter(u => u.age >= 30)
  .map(u => u.name)
  .reduce((acc, name) => acc + ", " + name);