Searches for the map for a given key.
Searches for the map for a given key.
the key to search for
true
if the key is in the map, false
otherwise
Queries the value for a given key.
Queries the value for a given key.
the key to look for
the value if it was found at the key, otherwise None
Reports the number of entries in the map.
Reports the number of entries in the map. This operation may take up to O(n) time, depending on the implementation.