Discuss MongoDB C100DBA Exam Topic 1 Question 37

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.

Suggested Answer: B

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11 comments · newest first

Mattie 11 months ago

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

Rebecka 12 months ago

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

Norah 12 months ago

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

Ezekiel 12 months ago

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

Naomi 1 year ago

$addToSet prevents duplicates, while $push just adds.

Franklyn 1 year 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?

Delmy 1 year 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.

Merilyn 1 year 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.

Whitney 1 year 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.

Keneth 1 year 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.

Adell 1 year 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.

MongoDB C100DBA Exam - Topic 1 Question 37 Discussion