const person = {
  name: "Marcus",
  greet: function () {
    const inner = () => `Hello, I am ${this.name}`;
    return inner();
  },
  greetArrow: () => {
    return `Hello, I am ${this.name}`;
  },
};

const detached = person.greet;

console.log(person.greet());
console.log(person.greetArrow());
console.log(detached?.());