Inherited hook in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method that runs when a subclass is created.

Ruby

class Parent
  def self.[1](subclass)
    puts "A new subclass: #{subclass}"
  end
end

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

Ainherited

Binitialize

Cnew

Dsubclass_created

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance methods like initialize instead of class methods.

Trying to use a method name that does not exist in Ruby hooks.

The inherited method is a special hook in Ruby that is called when a subclass is created.

2fill in blank

medium

Complete the code to call the inherited hook when a subclass is defined.

Ruby

class Parent
  def self.inherited(subclass)
    puts "Subclass created: [1]"
  end
end

class Child < Parent
end

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

AChild

Bsubclass

Cself

DParent

Attempts:

3 left

💡 Hint

Common Mistakes

Using the class name directly instead of the parameter.

Using self which refers to the parent class.

The subclass parameter in the inherited method refers to the new subclass being created.

3fill in blank

hard

Fix the error in the inherited hook to properly call the parent method.

Ruby

class Parent
  def self.inherited(subclass)
    [1]
    puts "Subclass: #{subclass}"
  end
end

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Asuper(subclass)

Bsuper()

Csuperclass

Dsuperclass(subclass)

Attempts:

3 left

💡 Hint

Common Mistakes

Calling super without arguments when the parent method expects one.

Using superclass which is not a method call.

Calling super(subclass) ensures the parent class's inherited method is called with the subclass argument.

4fill in blank

hard

Fill both blanks to create a subclass that triggers the inherited hook and prints its name.

Ruby

class Parent
  def self.inherited(subclass)
    puts "New subclass: [1]"
  end
end

class [2] < Parent
end

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

Asubclass

BChild

CParent

Dinherited

Attempts:

3 left

💡 Hint

Common Mistakes

Using the parent class name instead of the subclass name.

Not matching the subclass name in the class definition.

The subclass parameter holds the subclass name, and Child is the subclass defined.

5fill in blank

hard

Fill all three blanks to extend the inherited hook to track subclasses in a list.

Ruby

class Parent
  @subclasses = []

  def self.inherited(subclass)
    [1] << [2]
    puts "Tracking subclass: #{subclass}"
  end

  def self.[3]
    @subclasses
  end
end

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

A@subclasses

Bsubclass

Csubclasses

Dinherited

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance variables instead of class instance variables.

Not defining a method to return the subclasses list.

The class instance variable @subclasses stores subclasses. The method subclasses returns the list.