What’s the difference between findAndModify and update in MongoDB?

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If you fetch an item and then update it, there may be an update by another thread between those two steps. If you update an item first and then fetch it, there may be another update in-between and you will get back a different item than what you updated.

Doing it “atomically” means you are guaranteed that you are getting back the exact same item you are updating – i.e. no other operation can happen in between.

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