Self keyword behavior in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the current object using self.

Ruby

puts [1]

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

Aself

Bthis

Cme

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' or 'me' which are not Ruby keywords.

Trying to print an undefined variable instead of self.

In Ruby, self refers to the current object. Using puts self prints that object.

2fill in blank

medium

Complete the method to return the class of the current object using self.

Ruby

def get_class
  [1].class
end

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

Athis

Bself

Cobject

Dme

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' or 'me' which are not valid in Ruby.

Calling class on an undefined variable.

The keyword self refers to the current object, so self.class returns its class.

3fill in blank

hard

Fix the error by replacing the blank with the correct keyword to call a method on the current object.

Ruby

def greet
  [1].say_hello
end

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

Aobject

Bthis

Cme

Dself

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' or 'me' which cause errors.

Omitting the receiver when explicit self is needed.

To call a method on the current object, use self. Other options are not valid Ruby keywords.

4fill in blank

hard

Fill the blank to define a class method using self.

Ruby

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

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

Athis

Bme

Cself

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance method syntax instead of class method syntax.

Using invalid keywords like 'this' or 'me'.

Class methods are defined by prefixing the method name with self. inside the class.

5fill in blank

hard

Fill all three blanks to complete the code that prints the object id using self inside an instance method.

Ruby

class Item
  def print_id
    id = [1].[2]
    puts "ID: [3]"
  end
end

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

Aself

Bobject_id

C#{id}

Dthis

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' instead of 'self'.

Forgetting to use string interpolation to print the variable.

Inside an instance method, self.object_id gets the object's id. To print it inside a string, use string interpolation #{id}.