Question

To avoid treating numeric or boolean literals as projection flags, use the _______ expression to wrap the numeric or boolean literals.

(a) $literal

(b) $bool

(c) $unwin

(d) None of the mentioned

I got this question during an internship interview.

The origin of the question is Aggregation Mechanics in section Aggregation Concepts and Aggregation Mechanics of MongoDB

Answer 1

Correct option is (a) $literal

Easiest explanation: The $literal expression has the following syntax: { $literal: <value> }