Can you explain this JavaScript code?
```
const _allposts = (postsjson as [string, Post.Post][]).filter((e) => {
  return !(e[1].options && e[1].options.includes('unlisted'));
});
``` Your answer should have exactly 3 paragraphs. Make sure that the first paragraph starts with the word "personal" and that each paragraph is separated by two new lines.
user