List control interface.
Add a target to the list.
Rest
To be added
Delete the target from the list.
To be deleted
If the target is successfully deleted true, otherwise false
Find the target in the list.
what to look for
If a target exists, that target; if it does not exist, it is undefined
Check the presence of a target in the list.
the objects to check for existence
True if the object exists, false otherwise
List control interface.