MongoDB C100DBA Exam - Topic 1 Question 37 Discussion

Actual exam question for MongoDB's C100DBA exam

Question #: 37
Topic #: 1

The difference between $push and $addToSet is:

A$addToSet needs the fields to be already present while $push will work even if the field is not present

B$addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not

C$addToSet adds the item to the field only if the new item is of the same datatype

DThere is no major difference between them. $addToSet is a deprecated version of $push.

Show Suggested Answer

Suggested Answer: B

by Bobbye at May 06, 2022, 07:23 PM

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Mattie

4 months ago

$push is more flexible, but $addToSet is cleaner for unique values.

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Rebecka

4 months ago

$addToSet is definitely not deprecated, that's a myth!

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Norah

4 months ago

Wait, I thought $addToSet was just a fancy $push?

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Ezekiel

4 months ago

Totally agree, $push doesn't check for existing items!

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Naomi

5 months ago

$addToSet prevents duplicates, while $push just adds.

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Franklyn

5 months ago

I thought $addToSet was just a different way to do what $push does, but I don't think it's deprecated. There has to be a clear difference, right?

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Delmy

5 months ago

I remember practicing a question about this, and I think $push can add to a field even if it doesn't exist yet, but $addToSet needs the field to be there first.

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Merilyn

5 months ago

I think $addToSet only adds items if they aren't already in the array, while $push just adds them regardless. That sounds right, but I'm not completely sure.

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Whitney

5 months ago

I feel like $addToSet is about uniqueness, but I can't recall if it checks for data types. I might be mixing it up with something else.

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Keneth

5 months ago

This seems like a tricky one. I'll need to draw out the activity diagram and really think through the logic to get the right answer.

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Adell

5 months ago

This looks like a pretty standard costing question. As long as I apply the variable cost percentages correctly, I should be able to arrive at the right answer.

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