Awesome share Matt! (or do you go by Matthew?)

var duplicateNotes = notes.filter((note) => note.title === title)

Your explanation of how it works is correct. Since notes contains a list of javascript object like

{
  title: 'Some String'
  body: 'whatever'
}

It basically is "filter"-ing out from your array of objects that matches those conditions... in this case "title".

The ((note)) part is arbitrary. You could have put apple and do the comparison like apple.title === title.

It is not related to the note variable you created initially in the addNote function. Hope that helps :)