Instance variables (@) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an instance variable in the initialize method.

Ruby

class Person
  def initialize(name)
    [1] = name
  end
end

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

A@name

Bname

C$name

Dself.name

Attempts:

3 left

💡 Hint

Common Mistakes

Using a local variable instead of an instance variable.

Using global variable syntax ($) instead of instance variable (@).

The @ symbol is used to define instance variables in Ruby. Here, @name stores the value for each object.

2fill in blank

medium

Complete the code to access the instance variable inside a method.

Ruby

class Car
  def initialize(model)
    @model = model
  end

  def show_model
    puts [1]
  end
end

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

Amodel

Bself.model

C@model

D$model

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to access the variable without @.

Using global variable syntax ($) instead of instance variable (@).

To access an instance variable inside a method, use the @ symbol before the variable name.

3fill in blank

hard

Fix the error in the code by completing the instance variable assignment.

Ruby

class Book
  def initialize(title)
    [1] = title
  end

  def title
    @title
  end
end

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

A@title

Btitle

C$title

Dself.title

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning to a local variable instead of an instance variable.

Using global variable syntax ($) instead of instance variable (@).

The instance variable must be assigned with @title to be accessible in other methods.

4fill in blank

hard

Fill both blanks to create a method that updates and returns an instance variable.

Ruby

class User
  def initialize(age)
    @age = age
  end

  def birthday
    @age [1] 1
    return [2]
  end
end

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

A+=

B-=

C@age

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using -= instead of +=.

Returning a local variable instead of the instance variable.

The += operator adds 1 to the instance variable @age. Then returning @age shows the updated value.

5fill in blank

hard

Fill all three blanks to define an instance variable, update it, and return it.

Ruby

class Counter
  def initialize(start)
    [1] = start
  end

  def increment
    [2] [3] 1
    return @count
  end
end

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

A@count

B+=

C-=

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning to a local variable instead of an instance variable.

Using -= instead of +=.

Trying to update a variable without @.

Instance variable @count is assigned in initialize, incremented with +=, and returned.