Factory & Constructor Functions

What is an advantage of using Factory Functions for creating objects with private state?

function createCounter() {
  let count = 0;
  return {
    increment() { return ++count; },
    decrement() { return --count; },
    getCount() { return count; }
  };
}

They use less memory than constructors
They execute faster than constructors
They provide true encapsulation through closures
Factory functions can create true private state through closures. In this example, 'count' is only accessible through the methods returned by the factory, providing genuine encapsulation. Constructor functions and classes (prior to private fields) can't achieve this level of privacy as their properties are always accessible from outside the object.
They automatically create singletons

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