Add the string value to the head (LPUSH) or tail (RPUSH) of the list stored at key. If the key
does not exist an empty list is created just before the append operation. If the key exists but
is not a List an error is returned.
<p>
Time complexity: O(1)
@param key
@param strings
@return Integer reply, specifically, the number of elements inside the list after the push
operation.
Add the string value to the head (LPUSH) or tail (RPUSH) of the list stored at key. If the key does not exist an empty list is created just before the append operation. If the key exists but is not a List an error is returned. <p> Time complexity: O(1) @param key @param strings @return Integer reply, specifically, the number of elements inside the list after the push operation.