Extend for class methods in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a module method that can be used as a class method.

Ruby

module Greetings
  def [1](name)
    "Hello, #{name}!"
  end
end

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Amodule.say_hello

Bself.say_hello

Csay_hello

Ddef say_hello

Attempts:

3 left

💡 Hint

Common Mistakes

Adding 'self.' inside the module method definition.

The method inside the module is defined normally. To use it as a class method, it will be extended later.

2fill in blank

medium

Complete the code to extend the module as class methods in the class.

Ruby

class Person
  extend [1]
end

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AGreetings

Bself.Greetings

Cinclude Greetings

Dmodule Greetings

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'include' instead of 'extend'.

Using extend Greetings adds the module methods as class methods to Person.

3fill in blank

hard

Fix the error in calling the class method from the module.

Ruby

puts Person.[1]("Alice")

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AsayHello

BGreetings.say_hello

Csay_hello

Dself.say_hello

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the method with module prefix or wrong method name.

The class method is called directly on the class with the method name defined in the module.

4fill in blank

hard

Fill both blanks to define and extend a module with a class method.

Ruby

module Logger
  def [1](msg)
    puts "Log: #{msg}"
  end
end

class App
  [2] Logger
end

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Alog

Binclude

Cextend

Ddef

Attempts:

3 left

💡 Hint

Common Mistakes

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

Define the method 'log' in the module and use 'extend' to add it as a class method to App.

5fill in blank

hard

Fill all three blanks to create a module with a class method and call it.

Ruby

module Utils
  def [1](value)
    value * 2
  end
end

class Calculator
  [2] Utils
end

result = Calculator.[3](5)
puts result

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Adouble

Bextend

Dinclude

Attempts:

3 left

💡 Hint

Common Mistakes

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

The method 'double' is defined in the module. The class extends the module to get class methods. Then the method is called on the class.