Array Update Operators

$

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.

$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.