def alphabetize(arr, rev=false) arr.sort! rev ? arr.reverse! : nil arr end numbers = [3, 9, 3, 2, 1] alphabetize(numbers) puts numbers
After looking at other users responses prior to this lesson, I learned to add the variable
arr on line four. My question is, what is the purpose of this? It did not work when I did not add
arr before. Any explanation?