Very concise quicksort

quicksort.rb

class Array
  def quicksort
    return [] if empty?
    pivot = delete_at(rand(size))
    left, right = partition(&pivot.method(:>))
    return *left.quicksort, pivot, *right.quicksort
  end
end

My blog post breaking this algorithm down: https://medium.com/@adames/quicksort-partition-and-method-methods-f904417af5ee