Array Update Operators¶

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注解

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

Update Operators¶

Name	Description
`$`	Acts as a placeholder to update the first element that matches the query condition in an update.
`$addToSet`	Adds elements to an array only if they do not already exist in the set.
`$pop`	Removes the first or last item of an array.
`$pullAll`	Removes all matching values from an array.
`$pull`	Removes all array elements that match a specified query.
`$pushAll`	Deprecated. Adds several items to an array.
`$push`	Adds an item to an array.

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

← $currentDate $ (update) →