13.9 The instance type

delete()
The delete() method deletes any element with string key from the instance.

hasKey()
The hasKey() method returns a boolean indicating whether the key exists in the instance.

items()
The items() method returns a list of the [key,value] pairs in a instance.

keys()
The keys() method returns a list of the keys defined in a instance.

len()
The len() method returns the number of entries in a instance.

values()
The values() method returns a list of the values in a instance.