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______ binds variables for use in the specified expression.

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______ binds variables for use in the specified expression.

(a) $skip

(b) $let

(c) $bind

(d) None of the mentioned

The question was asked during an online interview.

The question is from Aggregation Mechanics topic in chapter Aggregation Concepts and Aggregation Mechanics of MongoDB

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Best answer
Right answer is (b) $let

For explanation: $let also returns the result of the expression.

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