TypeCommand
TYPE _key_
Time complexity: O(1)Return the type of the value stored at key in form of astring. The type can be one of "none", "string", "list", "set"."none" is returned if the key does not exist.
Return value
Status code reply, specifically:"none" if the key does not exist "string" if the key contains a String value "list" if the key contains a List value "set" if the key contains a Set value