Included hook in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a module with an included hook method.

Ruby

module Greetings
  def self.[1](base)
    puts "Module included in #{base}"
  end
end

Drag options to blanks, or click blank then click option'

Aincluded

Bextend

Cinclude

Dinitialize

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'include' instead of 'included' for the hook method.

Defining the hook as an instance method instead of a class method.

The included method is a special hook in Ruby modules that runs when the module is included in another class or module.

2fill in blank

medium

Complete the code to include the module and trigger the included hook.

Ruby

class Person
  [1] Greetings
end

Drag options to blanks, or click blank then click option'

Aextend

Binclude

Cprepend

Dusing

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extend' which adds methods as class methods instead of instance methods.

Using 'prepend' which changes method lookup order.

The include keyword adds the module's methods as instance methods to the class and triggers the included hook.

3fill in blank

hard

Fix the error in the included hook method definition.

Ruby

module Logger
  def self.included(base)
    base.[1] LoggerMethods
  end
end

Drag options to blanks, or click blank then click option'

Ainclude

Busing

Cextend

Dprepend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'include' instead of 'extend' inside the included hook.

Not calling any method on base, causing no effect.

Inside the included hook, calling base.extend LoggerMethods adds methods as class methods to the including class.

4fill in blank

hard

Fill both blanks to define a module with an included hook that adds class methods.

Ruby

module Trackable
  def self.[1](base)
    base.[2] ClassMethods
  end

  module ClassMethods
    def track
      puts "Tracking enabled"
    end
  end
end

Drag options to blanks, or click blank then click option'

Aincluded

Binclude

Cextend

Dprepend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'include' instead of 'extend' to add class methods.

Misnaming the hook method.

The included hook is used to call extend on the base class to add class methods from the nested module.

5fill in blank

hard

Fill all three blanks to create a module with an included hook that adds instance and class methods.

Ruby

module Auditable
  def self.[1](base)
    base.[2] InstanceMethods
    base.[3] ClassMethods
  end

  module InstanceMethods
    def audit
      puts "Instance audit"
    end
  end

  module ClassMethods
    def audit
      puts "Class audit"
    end
  end
end

Drag options to blanks, or click blank then click option'

Aincluded

Binclude

Cextend

Dprepend

Attempts:

3 left

💡 Hint

Common Mistakes

Using extend for instance methods or include for class methods.

Forgetting to define the hook as a class method.

The included hook calls include to add instance methods and extend to add class methods to the base.