Method overriding in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to override the method greet in the subclass.

Ruby

class Parent
  def greet
    puts "Hello from Parent"
  end
end

class Child < Parent
  def [1]
    puts "Hello from Child"
  end
end

child = Child.new
child.greet

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

Agreeting

Bhello

Cgreet

Dsay_hello

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name in the subclass so it doesn't override.

Forgetting to define the method in the subclass.

The method greet in the subclass overrides the one in the parent class.

2fill in blank

medium

Complete the code to call the parent class method greet inside the overridden method.

Ruby

class Parent
  def greet
    puts "Hello from Parent"
  end
end

class Child < Parent
  def greet
    [1]
    puts "Hello from Child"
  end
end

child = Child.new
child.greet

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

Asuper

Bsuper.greet

CParent.greet

Dself.greet

Attempts:

3 left

💡 Hint

Common Mistakes

Calling super.greet which is invalid syntax in Ruby.

Calling Parent.greet which is a class method call, not instance method.

Using super calls the parent class method with the same name.

3fill in blank

hard

Fix the error in the code by correctly overriding the method info.

Ruby

class Animal
  def info
    puts "I am an animal"
  end
end

class Dog < Animal
  def [1]
    puts "I am a dog"
  end
end

dog = Dog.new
dog.info

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

AInfo

Binfo

Cinformation

Ddetails

Attempts:

3 left

💡 Hint

Common Mistakes

Using capitalized method name Info which does not override.

Using a different method name that does not match the parent.

Method names are case-sensitive. The method must be named exactly info to override.

4fill in blank

hard

Fill both blanks to override the method describe and call the parent method inside it.

Ruby

class Vehicle
  def describe
    puts "This is a vehicle"
  end
end

class Car < Vehicle
  def [1]
    [2]
    puts "This is a car"
  end
end

car = Car.new
car.describe

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

Adescribe

Bsuper

Csuper.describe

Ddescription

Attempts:

3 left

💡 Hint

Common Mistakes

Using super.describe which is invalid syntax.

Using a different method name so the parent method is not overridden.

Override with the same method name describe and call super to invoke the parent method.

5fill in blank

hard

Fill all three blanks to override display, call the parent method, and add extra output.

Ruby

class Computer
  def display
    puts "Display from Computer"
  end
end

class Laptop < Computer
  def [1]
    [2]
    puts [3]
  end
end

laptop = Laptop.new
laptop.display

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

Adisplay

Bsuper

C"Display from Laptop"

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name so override does not happen.

Calling super.display which is invalid.

Not printing the extra message correctly.

Override display, call super to run parent method, then print extra message.