Function $addToSet

Returns an array of all the unique values for the selected field among for each document in that group.

$addToSet(collection, expr, options): unknown
Parameters
- collection: unknown[]
  The input array
- expr: unknown
  The right-hand side expression value of the operator
- options: Options
  The options to use for this operation
Returns unknown
- Defined in src/operators/accumulator/addToSet.ts:14