The Reverse(L) function reverses the order of the elements in list L.

Note: Within a procedure, it is likely that using negative indices is more efficient than creating a new list with elements that are reversed. Therefore, procedure Reverse should only be used for modifying lists that need to be returned in reverse order.

$\mathrm{with}\left(\mathrm{ListTools}\right)\:$

$L≔\left[1\,2\,3\,4\,5\,6\,7\,8\,9\,10\right]$

$L≔\left[1\,2\,3\,4\,5\,6\,7\,8\,9\,10\right]$

$L\left[7\right]$

$7$

$L\left[-7\right]$

$4$

$R≔\mathrm{Reverse}\left(L\right)$

$R≔\left[10\,9\,8\,7\,6\,5\,4\,3\,2\,1\right]$

$R\left[7\right]$

$4$