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Array Update Operators

Note

For details on specific operator, including syntax and examples, click on the specific operator to go to its reference page.

Update Operators

Name Description
$ Acts as a placeholder to update the first element that matches the query condition.
$[] Acts as a placeholder to update all elements in an array for the documents that match the query condition.
$[<identifier>] Acts as a placeholder to update all elements that match the arrayFilters condition for the documents that match the query condition.
$addToSet Adds elements to an array only if they do not already exist in the set.
$pop Removes the first or last item of an array.
$pull Removes all array elements that match a specified query.
$push Adds an item to an array.
$pullAll Removes all matching values from an array.

Update Operator Modifiers

Name Description
$each Modifies the $push and $addToSet operators to append multiple items for array updates.
$position Modifies the $push operator to specify the position in the array to add elements.
$slice Modifies the $push operator to limit the size of updated arrays.
$sort Modifies the $push operator to reorder documents stored in an array.
←   $unset $ (update)  →