normal_functions.js

function Person(firstName, lastName) {
  return {
    firstName,
    lastName,
    fullName() {
      console.log(`${this.firstName} ${this.lastName}`)
    }
  };
}

const personA = Person('Adrian', 'Perea');
const personB = Person('Ben', 'Halpern');

personA.fullName() // Adrian Perea
personB.fullName() // Ben Halpern