Sort and Return an Array of Objects with a Query Param in an Express API

We have an API that allows us to return a list of notes at /notes. We want to add the ability to sort that list by passing in the sort query param, which we read off of req.query. Once we know the expected sort order we pass a function to Array.prototype.sort that compares two notes' lastEdited values to decide which item comes first.

A quick refresher about how custom Array sort functions work in JavaScript. Sort takes a function with two params (which are items in the array). If the function returns true, the a item will be placed higher in the sorted array. If the function returns false, the b item will be placed higher.

View the source for this project on the projects github repo.