{ "ZSCORE": { "summary": "Returns the score of a member in a sorted set.", "complexity": "O(1)", "group": "sorted_set", "since": "1.2.0", "arity": 3, "function": "zscoreCommand", "command_flags": [ "READONLY", "FAST" ], "acl_categories": [ "SORTEDSET" ], "key_specs": [ { "flags": [ "RO", "ACCESS" ], "begin_search": { "index": { "pos": 1 } }, "find_keys": { "range": { "lastkey": 0, "step": 1, "limit": 0 } } } ], "reply_schema": { "oneOf": [ { "type": "number", "description": "The score of the member (a double precision floating point number). In RESP2, this is returned as string." }, { "type": "null", "description": "Member does not exist in the sorted set, or key does not exist." } ] }, "arguments": [ { "name": "key", "type": "key", "key_spec_index": 0 }, { "name": "member", "type": "string" } ] } }