Arrays on Ruby

Question

Can you explain use puts [-1] in array?

Answer 1

Like python, the negative indexing starts from where the array ends in ruby. It means that the index value of -1 gives the last element, and -2 gives the second last element of an array.
For example,

An array contains 4 elements,
a = [1,2,3,4]
a[-1] will print the last element 4
a[-2] indicate the 2nd last element 3.. and so on