All objects in the collection will be marked as no longer being in it, and the collection itself will cease to exist. Having called this function, you can no longer use collection in any way as the space it points to will have been deallocated. This removes all objects from a collection. That is the collection continues to exist, but is now empty. Overview Returns the number of objects currently in a collection.
Return result The number of objects in the collection, a long.
Return result The collection name as a string. The object whose collection membership is sought.