Custom modules as mixins in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the module as a mixin in the class.

Ruby

module Greetings
  def greet
    "Hello!"
  end
end

class Person
  [1] Greetings
end

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

Aimport

Bextend

Crequire

Dinclude

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extend' instead of 'include' adds methods as class methods, not instance methods.

Using 'require' or 'import' does not mix in methods.

Use include to mix in a module's instance methods into a class.

2fill in blank

medium

Complete the code to call the mixin method from an instance.

Ruby

module Logger
  def log(message)
    "Log: #{message}"
  end
end

class App
  include Logger
end

app = App.new
puts app.[1]("Started")

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

Aprint

Blog

Cputs

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call 'print' or 'puts' as the method from the module.

Using 'message' which is a parameter, not a method.

The method log is defined in the module and mixed in as an instance method, so call app.log.

3fill in blank

hard

Fix the error by choosing the correct keyword to add module methods as class methods.

Ruby

module Tools
  def info
    "Tool info"
  end

  def details
    "Details"
  end
end

class Machine
  [1] Tools
end

puts Machine.info

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

Aextend

Binclude

Crequire

Dimport

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'include' adds instance methods, so 'Machine.info' would fail.

Using 'require' or 'import' does not add methods to the class.

Use extend to add module methods as class methods.

4fill in blank

hard

Fill both blanks to create a mixin module and include it in a class.

Ruby

module [1]
  def shout
    "Hey!"
  end
end

class [2]
  include Shoutable
end

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

AShoutable

BTalker

CSpeaker

DListener

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between module name and the name used in include.

Using unrelated class names.

The module name must match the one included in the class. The class name can be any valid name.

5fill in blank

hard

Fill all three blanks to define a module with an instance method, include it in a class, and call the method.

Ruby

module [1]
  def greet
    "Hi!"
  end
end

class [2]
  [3] Greetings
end

obj = Greeter.new
puts obj.greet

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

AGreetings

BGreeter

Cinclude

Dextend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extend' instead of 'include' for instance methods.

Mismatch in module or class names.

The module is named 'Greetings', the class 'Greeter' includes it with 'include', then the instance calls the method.