Obtains a the value mapped by key. A value for key is expected to exist
in the map.
Note: Use this method if it is sure that a value for key is in the map,
in other words, it would be a bug if it isn't. To look up a mapping that
may or may not exist, use the 'in' operator (opBinaryRight"in" above).
Obtains a the value mapped by key. A value for key is expected to exist in the map.
Note: Use this method if it is sure that a value for key is in the map, in other words, it would be a bug if it isn't. To look up a mapping that may or may not exist, use the 'in' operator (opBinaryRight"in" above).