Open struct for dynamic objects in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new OpenStruct object.

Ruby

require 'ostruct'
obj = [1].new

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

AObject

BStruct

CHash

DOpenStruct

Attempts:

3 left

💡 Hint

Common Mistakes

Using Struct instead of OpenStruct

Using Object which is too general

OpenStruct is the class used to create dynamic objects in Ruby.

2fill in blank

medium

Complete the code to set a dynamic attribute 'name' to 'Alice'.

Ruby

require 'ostruct'
obj = OpenStruct.new
obj.[1] = 'Alice'

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

Aname

Bkey

Cattr

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'value' or 'attr' instead of 'name'

The attribute 'name' is set dynamically on the OpenStruct object.

3fill in blank

hard

Complete the code to access a missing attribute that returns nil instead of raising an error.

Ruby

require 'ostruct'
obj = OpenStruct.new
puts obj.[1]

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

Aname

Bundefined

Cnonexistent

Dmissing_attr

Attempts:

3 left

💡 Hint

Common Mistakes

Expecting an error when accessing missing attributes

Accessing a missing attribute like 'missing_attr' returns nil without error in OpenStruct.

4fill in blank

hard

Fill both blanks to create an OpenStruct with the 'age' attribute set to 30.

Ruby

require 'ostruct'
obj = OpenStruct.new([1] => [2])

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A:age

B30

C'city' => 'Paris'

D:city

Attempts:

3 left

💡 Hint

Common Mistakes

Using string keys instead of symbols

Incorrect hash syntax

Use a hash with symbol keys and values to initialize OpenStruct attributes.

5fill in blank

hard

Fill all three blanks to add a new attribute 'country' with value 'France' to an existing OpenStruct object.

Ruby

require 'ostruct'
obj = OpenStruct.new(city: 'Paris')
obj.[1] = [2]
puts obj.[3]

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

Acountry

B'France'

Dcity

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong attribute names

Forgetting quotes around string values

You assign the new attribute 'country' with value 'France' and then print it.