Array update - operators

Array update operators are used to modify array elements and structure.

	Description
$	The $ positional operator identifies an element in an array to update without explicitly specifying the position of the element in the array.
$addToSet	The addToSet operator adds elements to an array if they don't already exist, while ensuring uniqueness of elements within the set.
$each	The $each operator is used within an $addToSet or $push operation to add multiple elements to an array field in a single update operation.
$pop	The $pop operator removes the first or last element of an array.
$position	The $position is used to specify the position in the array where a new element should be inserted.
$[]	The $[] operator is used to update all elements in an array that match the query condition.
$[identifier]	The $[identifier] operator is used to update all elements using a specific identifier in an array that match the query condition.
$pull	Removes all instances of a value from an array.
$pullAll	The $pullAll operator is used to remove all instances of the specified values from an array.
$push	The $push operator adds a specified value to an array within a document.