Immutable data with freeze in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to freeze the string so it cannot be changed.

Ruby

name = "Ruby".[1]
name << "Lang"

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

Aupcase

Bfreeze

Creverse

Dcapitalize

Attempts:

3 left

💡 Hint

Common Mistakes

Using string methods that modify content instead of freezing.

Not calling any method and expecting immutability.

Using freeze makes the string immutable, so appending to it causes an error.

2fill in blank

medium

Complete the code to freeze the array so it cannot be modified.

Ruby

numbers = [1, 2, 3].[1]
numbers << 4

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

Areverse

Bsort

Cfreeze

Duniq

Attempts:

3 left

💡 Hint

Common Mistakes

Using sorting or reversing methods instead of freezing.

Trying to modify without freezing first.

Calling freeze on the array prevents adding new elements.

3fill in blank

hard

Fix the error by freezing the hash so it cannot be changed.

Ruby

config = {mode: 'dark', volume: 10}
config.[1]
config[:mode] = 'light'

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

Afreeze

Bdelete

Cdup

Dclear

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods that remove or copy instead of freezing.

Not freezing before trying to modify.

Freezing the hash prevents changing its keys or values.

4fill in blank

hard

Fill both blanks to create a frozen array and check if it is frozen.

Ruby

arr = [10, 20, 30].[1]
puts arr.[2]

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

Afreeze

Bfrozen?

Cempty?

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using empty? or length instead of frozen?.

Not freezing the array before checking.

First, freeze the array to make it immutable, then check with frozen?.

5fill in blank

hard

Fill all three blanks to freeze a nested hash and check if the nested array is frozen.

Ruby

settings = {theme: 'blue', options: [1, 2, 3]}
settings = settings.[1]
puts settings[:options].[2]
settings[:options].[3]

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

Afreeze

Bfrozen?

Ddup

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming freezing outer hash freezes nested objects.

Not freezing nested array separately.

Freeze the outer hash, check if the nested array is frozen (it is not), then freeze the nested array separately to make it immutable.