echo $BRAIN_STUFF

The following example returns the distinct values for the field sizes from all documents in the Collection1 collection:

db.getCollection('inventory').distinct('storeCode')

This will be the expected result:

[
     "1502", "1002", "747"
]

Distinct, as for relational database, finds the distinct values for a specified field across a single collection or view and returns the results in an array.