Groovy lists have a lot of features. One of them is the possibility to use negative indices. A negative index counts from the end of the list backward. So if we use -1 as index we get the last entry, if we use -2 as index we get the next-to-last entry.
def list =  list << 'Item 1' list << 'Item 2' list << 'Item 3' assert 'Item 3' == list[-1] assert 'Item 2' == list[-2] assert 'Item 1' == list[0 - list.size()]