Factory Functions & Singleton Pattern

What does Object.freeze() accomplish in this factory function?

const createImmutablePerson = (name, age) => {
  return Object.freeze({
    name,
    age,
    greet() {
      return `Hello, I'm ${name}`;
    }
  });
};

It improves performance
It prevents the object's properties from being modified
Object.freeze() prevents the object's properties from being modified: 1) It makes all direct properties of the object immutable, 2) Attempts to add, change, or delete properties will fail (silently in non-strict mode, with an error in strict mode), 3) It creates truly immutable objects that cannot be altered after creation, 4) The object's methods can still access the enclosing variables through closure, 5) This provides safer objects in applications where data integrity is important, 6) However, it only freezes the top level (shallow freeze), nested objects would need separate freezing.
It secures the object from hackers
It reduces memory usage

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