Available since: 2.0.0
Time complexity: O(N) where N is the number of fields being requested.
Returns the values associated with the specified
fields in the hash stored at
field that does not exist in the hash, a
nil value is returned.
Because non-existing keys are treated as empty hashes, running
key will return a list of
Array reply: list of values associated with the given fields, in the same order as they are requested.