Can you identify the behaviour of following code snippet? | JavaScript Output Questions | Problem Solving | JavaScript Copy

If asked to glance over the following code snippet and identify the behaviour of the duplicate function then what do you think is happening in the following code snippet?

const original = {
  id: 'xhdyt0123',
  link: 'https://www.youtube.com/watch?v=_eaCs-pzaVg',
  metadata: {
    title: 'Build Your Own Redux',
    description: 'In this video we are going to see how we an build our own Redux',
  },
  published: true
}

const duplicate = (original) => {
  if (!original.published) {
    throw new Error('Your post needs to published before duplication'); 
  }

  const copy = {
    id: +new Date(),
    link: original.link,
    metadata: original.metadata,
    published: original.published
  };

  copy.metadata.title = `Copy of ${original.metadata.title}`;

  return copy;
};

duplicate(original);