Module in Ruby

Outline
Module
Namespace
Define Module
Mix-in
Complete

Outline

In this blog post, we’ll see what the module is, and how to use it.

Module

The Module is a bundle of the processes, and you can define the module by the Module statement.

module ModuleName
...
end

The module name is started with capital.

Namespace

You can distinct the Same name but different features by adding the namespace. In Ruby, You can prevent the conflict of the methods, constants, and classes name by using the module.

You can use the methods or constants provided by the module.

Math::PI
Math.sqrt(2)

You can use :: to refer to the constants and use . for the methods of the module. If you use the module constants and methods many times, you can use include to refer them.

include Math

PI
sqrt(2)

Define Module

As you see above, you can use . for the methods of the module. But simply defining a method in the module can’t be used as above.

To make the method defined in the module be used by ., you should use module_function for them.

module Greeting
  def hello
    puts "Hello"
  end

  module_function :hello
end

Gretting.hello

Mix-in

The Mix-in means that you use include to load the module in the class.

module Greeting
  def hello
    puts "Hello"
  end
end

class World
  include Greeting
end

world = World.new
world.hello

Complete

We’ve seen how to define the module and how to use it in Ruby. From now on, let’s use the Module when you need to gather the many procedures!

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