Aggregation Variable OperatorsΒΆ


For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.

Name Description
$map Applies a subexpression to each element of an array and returns the array of resulting values in order. Accepts named parameters.
$let Defines variables for use within the scope of a subexpression and returns the result of the subexpression. Accepts named parameters.