How to get the latest and oldest record in mongoose.js (or just the timespan between them)

Question

Basic problem

I have a bunch of records and I need to get latest (most recent) and the oldest (least recent).

When googling I found this topic where I saw

Answer 1

Fast and Simple - One Line Solution

Get 10 latest documents

MySchema.find().sort({ _id: -1 }).limit(10)

Get 10 oldest documents

MySchema.find().sort({ _id: 1 }).limit(10)

In case you want sorting based on some other property i.e. createdAt and get the oldest or latest. Again it is similar to the above query.

MySchema.find().sort({ createdAt: 1 }).limit(10)  // oldest docs
MySchema.find().sort({ createdAt: -1 }).limit(10) // latest docs