Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

The correct answer is B. $push along with $each, $sort and $slice. $push combined with the $each, $sort, and $slice modifiers is the correct MongoDB approach for controlling array size during an update - $slice specifically caps the number of elements kept in the array (positive value keeps from the start, negative from the end). $arrayLimit (op

MongoDB Fundamentals

Question

Options

A$arrayLimit
B$push along with $each, $sort and $slice
C$removeFromSet
DNone of the above

How the community answered

(44 responses)

A
9% (4)
B
84% (37)
C
2% (1)
D
5% (2)

Explanation

$push combined with the $each, $sort, and $slice modifiers is the correct MongoDB approach for controlling array size during an update - $slice specifically caps the number of elements kept in the array (positive value keeps from the start, negative from the end). $arrayLimit (option A) does not exist in MongoDB; it is a fabricated operator. $removeFromSet (option C) is also fictitious - the real operator for removing elements from an array is $pull or $pop, neither of which limits size post-update. Option D falls away because a valid solution does exist.

Memory tip: Think of the combo as a pipeline in one operator - Enter elements ($each), Sort them ($sort), then Slice to size ($slice) - ESS rides inside $push.

Topics

#$push#$slice#array update operators#$each

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