Instance_variable_get and set in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the value of the instance variable @name.

Ruby

class Person
  def initialize(name)
    @name = name
  end

  def get_name
    [1]
  end
end

person = Person.new("Alice")
puts person.get_name

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

A@name = name

Binstance_variable_set(:@name)

Cinstance_variable_get(:@name)

Dget_instance_variable(:@name)

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance_variable_set instead of instance_variable_get.

Trying to access @name directly inside another method without returning it.

The method instance_variable_get(:@name) returns the value of the instance variable @name.

2fill in blank

medium

Complete the code to set the value of the instance variable @age to 30.

Ruby

class Person
  def initialize(age)
    [1]
  end

  def get_age
    instance_variable_get(:@age)
  end
end

person = Person.new(30)
puts person.get_age

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

Ainstance_variable_get(:@age)

Binstance_variable_set(:@age, age)

C@age = age

Dset_instance_variable(:@age, age)

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance_variable_get instead of instance_variable_set.

Assigning @age directly without using the method.

The method instance_variable_set(:@age, age) sets the instance variable @age to the value of age.

3fill in blank

hard

Fix the error in the code to correctly set the instance variable @city to 'Paris'.

Ruby

class Location
  def initialize(city)
    [1]
  end

  def get_city
    instance_variable_get(:@city)
  end
end

loc = Location.new("Paris")
puts loc.get_city

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

Ainstance_variable_set(:@city, city)

Binstance_variable_get(:@city, city)

Cinstance_variable_set(:city, city)

D@city = city

Attempts:

3 left

💡 Hint

Common Mistakes

Missing '@' in the symbol for the variable name.

Using instance_variable_get instead of instance_variable_set.

The correct way to set the instance variable using instance_variable_set requires the variable name as a symbol with '@' and the value.

4fill in blank

hard

Fill both blanks to create a hash of instance variable names and their values for variables with names longer than 3 characters.

Ruby

class Data
  def initialize
    @id = 1
    @name = "Data"
    @val = 100
  end

  def long_vars
    vars = instance_variables.select { |var| var.to_s.[1] 3 }
    { var => instance_variable_get(var) [2] var in vars }
  end
end

data = Data.new
puts data.long_vars

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

Alength >

Blength <

Cfor

Dif

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' for length comparison.

Using 'if' instead of 'for' in the hash comprehension.

The code selects instance variables with names longer than 3 characters using var.to_s.length > 3 and creates a hash using a for loop.

5fill in blank

hard

Fill all three blanks to set an instance variable dynamically, get its value, and print it.

Ruby

class DynamicVar
  def set_var(name, value)
    [1]
  end

  def get_var(name)
    [2]
  end
end

obj = DynamicVar.new
obj.set_var(:@color, "blue")
puts [3]

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

Ainstance_variable_set(name, value)

Binstance_variable_get(name)

Cobj.instance_variable_get(:@color)

Dobj.instance_variable_set(:@color, "blue")

Attempts:

3 left

💡 Hint

Common Mistakes

Using instance_variable_get to set a variable.

Trying to print the variable without calling instance_variable_get.

The method set_var uses instance_variable_set(name, value) to set the variable. The method get_var uses instance_variable_get(name) to get it. Finally, printing obj.instance_variable_get(:@color) shows the value.