What this does is tell Ruby that alphabetize has a second parameter, rev (for “reverse”) that will default to false if the user doesn’t type in two arguments.
“You might have noticed that our first call to alphabetize in exercise 1 was just alphabetize(books). Ruby didn’t see a rev , so it gave it the default value of false.”
Ruby didn’t see a ‘rev’, so it gave what the default value of ‘false’? The second parameter? But there is no second parameter in ‘alphabetize(books).’
alphabetize is a custom method that leverages the Array#sort method, which method has an optional parameter, rev that defaults to false if not specified.
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