1 2 3 4 5 6 7 8 9 10 11 12 13
Returns the number of fields contained in the hash stored at `key`. @return @integer-reply: number of fields in the hash, or `0` when `key` does not exist. @examples ```cli HSET myhash field1 "Hello" HSET myhash field2 "World" HLEN myhash ```