Return the number of items in a hash. <p> <b>Time complexity:</b> O(1) @param key @return The number of entries (fields) contained in the hash stored at key. If the specified key does not exist, 0 is returned assuming an empty hash.
See Implementation
Return the number of items in a hash. <p> <b>Time complexity:</b> O(1) @param key @return The number of entries (fields) contained in the hash stored at key. If the specified key does not exist, 0 is returned assuming an empty hash.