This version will reach end of life on Feb 2018. To upgrade, go to the Learn more about upgrading your version of MongoDB.

Aggregation Variable OperatorsΒΆ

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.