LindexCommand
Time complexity: O(n) (with n being the length of the list)Return the specified element of the list stored at the specifiedkey. 0 is the first element, 1 the second and so on. Negative indexesare supported, for example -1 is the last element, -2 the penultimateand so on.
If the value stored at key is not of list type an error is returned.If the index is out of range an empty string is returned.
Note that even if the average time complexity is O(n) asking forthe first or the last element of the list is O(1).
Bulk reply, specifically the requested element.
