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MongoDB C100DBA Exam - Topic 1 Question 37 Discussion

The difference between $push and $addToSet is:
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
A) $addToSet needs the fields to be already present while $push will work even if the field is not present
C) $addToSet adds the item to the field only if the new item is of the same datatype
D) There is no major difference between them. $addToSet is a deprecated version of $push.

MongoDB C100DBA Exam - Topic 1 Question 37 Discussion

Actual exam question for MongoDB's C100DBA exam
Question #: 37
Topic #: 1
[All C100DBA Questions]

The difference between $push and $addToSet is:

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Suggested Answer: B

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

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Mattie
8 months ago
$push is more flexible, but $addToSet is cleaner for unique values.
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Rebecka
9 months ago
$addToSet is definitely not deprecated, that's a myth!
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Norah
9 months ago
Wait, I thought $addToSet was just a fancy $push?
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Ezekiel
9 months ago
Totally agree, $push doesn't check for existing items!
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Naomi
9 months ago
$addToSet prevents duplicates, while $push just adds.
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Franklyn
9 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
9 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
9 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
9 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
9 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
9 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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