Factory function examples in JavaScript

factory-function.js

// dog example
const dog = () => {
  const sound = 'Where are my testicles, Summer?';
  return {
    talk: () => console.log(sound)
  }
}

const snuffles = dog();
snuffles.talk();


// create user example
const createUser = ({
  userName = 'Anonymous',
  avatar = 'anon.png'
} = {}) => ({
  userName,
  avatar
});
console.log(
  // { userName: "echo", avatar: 'anon.png' }
  createUser({ userName: 'echo' }),
  // { userName: "Anonymous", avatar: 'anon.png' }
  createUser()
);