👐 $limit

If we return too many documents but we're interested in only a few, we can limit the number of documents returned using $limit.

Instruqt

Open the 100_aggregation_pipeline_match file in the Instruqt IDE or GitHub Codespaces. Run the Startup Code, that will import all the neccessary modules and connect to the local MongoDB cluster.

 const cursor = await books.aggregate(  { $limit: 1 } );

 await cursor.forEach((b) => {
    console.log(b);
 });

Atlas UI

[
  { $limit: 1 }
]

MongoDB Shell

db.books.aggregate([
  { $limit: 1 }
])

This returns just one document.

👐 Return just 7 books.

Answer

Instruqt

 const cursor = await books.aggregate(  { $limit: 7 } );

 await cursor.forEach((b) => {
    console.log(b);
 });

Atlas UI

[
  { $limit: 7 }
]

MongoDB Shell

db.books.aggregate([
  { $limit: 7 }
])