Mixin VS Monkey patching

mixin_vs_monkey_patch.rb

######### MIXIN

module SplittableArray
  def split_by_half
    middle = (self.size.to_f / 2).floor
    return [self[0..middle], self[middle+1..self.size]]
  end
end

some_array = [1, 2, 3, 4, 5]
some_array.extend SplittableArray
some_array.split_by_half # => [[1, 2, 3], [4, 5]]


######### MONKEY PATCH ARRAY

class Array
  def split_by_half
    middle = (self.size.to_f / 2).floor
    return [self[0..middle], self[middle+1..self.size]]
  end
end

another_array = [6, 7, 8, 9, 10]
another_array.split_by_half # => [[6, 7, 8], [9, 10]]