The concept of array positional operators come from mongodb. Positional operators allow you to project a specific element in an array based on the query criteria specified.
Nodechef supports two positioanl operators which are the single position projector ($) and the multi position projector ($*)
Single position projector ($)
This projector allows you to project a single element from an array using the query predicate specified. The query returns the first element in the given array that matches the predicate.
Unlike mongodb, the Nodechef single position projector can project elements nested multiple levels in an array.