From MongoDB 4.4, you can use the $binarySize aggregation pipeline operator to return the size of a given string or binary data value’s content in bytes.
It accepts any valid expression as long as it resolves to either a string or binary data value. The argument can also be null, in which case, $binarySize returns null.
In MongoDB, the $type aggregation pipeline operator returns the BSON type of its argument.
You can use it to find out the type of a given field.
Continue readingFrom MongoDB 4.0, you can use the $toObjectId aggregation pipeline operator to convert a string to an ObjectId.
The string must be a hexadecimal string of length 24.
Continue readingIn MongoDB, the $rtrim aggregation pipeline operator removes whitespace from the end of a string. This includes the null character.
It can also remove any character specified. For example, you could use it to remove all periods (.), exclamation marks (!), etc from the end of a string.
In MongoDB, the $ltrim aggregation pipeline operator removes whitespace from the beginning of a string. This includes the null character.
It can also remove any character specified. For example, you could use it to remove all hyphen characters (-) from the beginning of a string.
In MongoDB, the $trim aggregation pipeline operator removes whitespace from the beginning and end of a string. This includes the null character.
It can also remove any character specified. For example, you could use it to remove all hyphen characters (-) or periods (.) or all s characters, etc.
The following table contains a list of whitespace characters that MongoDB removes by default when using the $trim, $ltrim, and $rtrim aggregation pipeline operators.
From MongoDB 4.0, you can use the $toLong aggregation pipeline operator to convert a value to a long.
From MongoDB 4.0, you can use the $toInt aggregation pipeline operator to convert a value to an integer.
From MongoDB 4.0, you can use the $toDouble aggregation pipeline operator to convert a value to a double.