How to pick a random element from an Array

Here’s a nifty little patch to Ruby’s Array class to provide a method for picking an element at random:

class Array
  def random_pick
    self.sort_by { rand }.first
  end
end

So then you can do things like this:

def what_is_your_favorite_color?
  colors = [ 'red', 'blue', 'green', 'yellow', 'purple', 'pink', 'black' ]
  colors.random_pick
end

Please don’t ask my why I’m doing this. The answer has something to do with test data.