Object object
) If an object equal to object
is in the set, return it.
Checks if there is an object in the set that is equal to object
.
If so, that object is returned, otherwise returns null.
Source
/**
* If an object equal to [object] is in the set, return it.
*
* Checks if there is an object in the set that is equal to [object].
* If so, that object is returned, otherwise returns null.
*/
E lookup(Object object);