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$Slice Operator In Mongodb Aggregation Framework

In this article, we will discuss the $slice operator in MongoDB aggregation framework.

Purpose

The $slice operator in MongoDB is used within the projection stage of an aggregation pipeline to return a subset of elements from an array field.

{
  $project: {
    fieldName: {
      $slice: [arrayField, numberOfElements]
    }
  }
}

Consider the following collection: -

To use the $slice, we will use the following code: -

db.sales.aggregate([{
    $project: {
        slicedOrders: {
            $slice: ["$orders", 1]
        }
    }
}])

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