Why modules solve multiple inheritance in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include a module in a class.

Ruby

module Greetings
  def hello
    puts 'Hello!'
  end
end

class Person
  [1] Greetings
end

p = Person.new
p.hello

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

Ainclude

Bextend

Cinherit

Drequire

Attempts:

3 left

💡 Hint

Common Mistakes

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

In Ruby, include is used to mix in a module's methods as instance methods in a class.

2fill in blank

medium

Complete the code to call a method from a module mixed into a class.

Ruby

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

class App
  include Logger

  def run
    [1]('Application started')
  end
end

app = App.new
app.run

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

Alog

Bprint

Cputs

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call puts instead of the module method log.

The method log is defined in the module and becomes available as an instance method in the class.

3fill in blank

hard

Fix the error in the code to correctly use multiple modules in a class.

Ruby

module A
  def greet
    puts 'Hello from A'
  end
end

module B
  def greet
    puts 'Hello from B'
  end
end

class Person
  include A
  [1] B
end

p = Person.new
p.greet

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

Arequire

Binclude

Cextend

Dinherit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extend' for the second module causing method to be unavailable as instance method.

To mix in multiple modules as instance methods, use include for each module.

4fill in blank

hard

Fill both blanks to define a module and include it in a class to solve multiple inheritance.

Ruby

module [1]
  def info
    puts 'Info from module'
  end
end

class Device
  [2] InfoModule
end

d = Device.new
d.info

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

AInfoModule

Binclude

Cextend

DModuleInfo

Attempts:

3 left

💡 Hint

Common Mistakes

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

Define the module with the correct name and include it in the class to add instance methods.

5fill in blank

hard

Fill all three blanks to create two modules and include both in a class to simulate multiple inheritance.

Ruby

module [1]
  def feature_a
    puts 'Feature A'
  end
end

module [2]
  def feature_b
    puts 'Feature B'
  end
end

class Gadget
  [3] FeatureA
  [3] FeatureB
end

g = Gadget.new
g.feature_a
g.feature_b

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

AFeatureA

BFeatureB

Cinclude

Dextend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'extend' instead of 'include' causing methods to be class methods.

Define two modules and include both in the class to add their methods as instance methods, simulating multiple inheritance.