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Which of the following accepts a single argument expression?

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+1 vote
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Which of the following accepts a single argument expression?

(a) $toLow

(b) $toUpper

(c) $toEqual

(d) None of the mentioned

I had been asked this question in exam.

My question is from Pipeline and Sharded Collections topic in section Aggregation Concepts and Aggregation Mechanics of MongoDB

1 Answer

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Best answer
Correct choice is (b) $toUpper

To explain: $toUpper converts a string to uppercase.

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