The Handbook for Ruby Developers/

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Modules

Modules

Learn what are modules and how to use them in Ruby.

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Definition

A module is a chunk of code we can include in a class or in another module:

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# MyModule contains logic for robot, human, and dog
module MyModule
  attr_accessor :x, :y
  def initialize(options={})
    @x = options[:x] || 0
    @y = options[:y] || 0
  end
  def right
    self.x += 1
  end
  def left
    self.x -= 1
  end
  def up
    self.y += 1
  end
  def down
    self.y -= 1
  end
end
class Robot
  include MyModule
  def label
    '*'
  end
end
class Dog
  include MyModule
  def up
  end
  def left
  end
  def label
    '@'
  end
end
class Human
  include MyModule
  def label
    'H'
  end
end

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