Ruby Dependency Injection

di_sample.rb

class Rabbit
  def initialize(color, size)
    @color = color 
    @size = size
  end
  
  def hop
    if @color == 'blue'
      puts "hopped #{2 * @size} feet"
    else
      puts "hopped #{4 * @size} feet"
    end
  end
end

# With explicit dependency injection it instead looks like this:

class Rabbit
  def hop(color, size)
    if color == 'blue'
      puts "hopped #{2 * size} feet"
    else
      puts "hopped #{4 * size} feet"
    end
  end
end