const obj = {
  name: 'Original',
  greet() {
    return function() {
      console.log(`Hello, ${this.name}`);
    };
  },
  arrowGreet() {
    return () => {
      console.log(`Hello, ${this.name}`);
    };
  }
};

const globalThis = { name: 'Global' };
const newObj = { name: 'New' };

const regularFn = obj.greet();
const arrowFn = obj.arrowGreet();

regularFn.call(newObj);