Class methods with self prefix in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a class method named greet.

Ruby

class Person
  def [1].greet
    puts "Hello!"
  end
end

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

Aclass

Bself

Cthis

Ddef

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' instead of 'self' to define class methods.

Forgetting to prefix the method name with 'self.'

In Ruby, class methods are defined by prefixing the method name with self. inside the class.

2fill in blank

medium

Complete the code to call the class method greet on the Person class.

Ruby

Person.[1]

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

Agreet

Bnew

Chello

Dsay

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call the method on an instance instead of the class.

Using a wrong method name.

Class methods are called on the class itself, so use Person.greet to call the method.

3fill in blank

hard

Fix the error in the class method definition by completing the blank.

Ruby

class Calculator
  def [1].add(a, b)
    a + b
  end
end

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

Athis

Bclass

Cself

Ddef

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' instead of 'self' in Ruby.

Omitting the prefix and defining an instance method instead.

Class methods must be defined with self. prefix, not 'this' or other keywords.

4fill in blank

hard

Fill both blanks to define a class method description that returns a string.

Ruby

class Book
  def [1].[2]
    "A great read"
  end
end

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

Aself

Bclass

Cdescription

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'class' instead of 'self' for the prefix.

Using wrong method names like 'info'.

Class methods use self prefix and the method name is description here.

5fill in blank

hard

Fill all three blanks to define and call a class method info that returns a string.

Ruby

class Animal
  def [1].[2]
    "Friendly animal"
  end
end

puts Animal.[3]

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

Aself

Binfo

Ddescription

Attempts:

3 left

💡 Hint

Common Mistakes

Using different method names in definition and call.

Forgetting the self prefix in the method definition.

The class method is defined with self.info and called as Animal.info.