With -1, you access the last element in an array by looping back around with a negative number.



q1 = %w[ January February March ]
puts q1[1]
puts q1[-2]

1.	have an array that contains objects from different classes, not all just one type.
2.	Accessing Elements
3.	use the at method
4.	Access the last element in the array
5.	To change three of the elements to have German rather than English spelling.
6.	With start and length parameters
7.	Replacing subarrays with []=
8.	Change character case of an element

With -1, you access the last element in an array by looping back around with a negative number. : Array Elements « Array « Ruby