This program takes a string as an input, and outputs the words in reverse order.
Initialize a new instance of the Flipbook class. Pass in a string to the flip_book, which will output the words in reverse order.
Example:
f = Flipbook.new
puts f.flip_book("dog lazy the over jumps fox brown quick The")
#=> The quick brown fox jumps over the lazy dogInstead of using the split method to split the string into an array, I used scan to separate the string into an array, based on the regular expression pattern of a word. But instead of looping through the newly-created array, I had scan pass each word into a block that I unshifted onto the beginning of the reverse array, thus reversing the order of the words as it is splitting them up. Since reverse is still an array, and we want to return a string, I ran join on the reverse array to convert it and add spaces between words.