When a function belongs to an object, we call it a method.

Inside an object method, we can use the this keyword. Methods understand that this is referring to the object itself.

Take a look at this example:

const person = {
  firstName: 'Bob',
  lastName: 'Marley',
  getFullName: function () {
    return this.firstName + ' ' + this.lastName;
  },
};

const fullName = person.getFullName();
console.log(fullName);