Frozen objects in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to freeze the string.

Ruby

str = "hello"
str.[1]

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

Aseal

Bfreeze

Clock

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods like lock or seal which don't exist in Ruby.

The freeze method makes the object immutable in Ruby.

2fill in blank

medium

Complete the code to check if the array is frozen.

Ruby

arr = [1, 2, 3]
puts arr.[1]

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

Afrozen?

Bis_frozen

Clocked?

Dimmutable?

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like is_frozen or locked?.

The frozen? method returns true if the object is frozen.

3fill in blank

hard

Fix the error in the code that tries to modify a frozen string.

Ruby

str = "hello".[1]
str << " world"

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

Afreeze

Bclone

Cdup

Dcopy

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to modify the frozen string directly.

Duplicating the string with dup creates a mutable copy to modify.

4fill in blank

hard

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

Ruby

hash = {a: 1, b: 2}.[1]
puts hash.[2]

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

Afreeze

Bfrozen?

Cis_frozen

Dlock

Attempts:

3 left

💡 Hint

Common Mistakes

Using is_frozen or lock which are not Ruby methods.

Use freeze to freeze the hash and frozen? to check it.

5fill in blank

hard

Fill all three blanks to freeze an array, check if it's frozen, and attempt to modify it safely.

Ruby

arr = [1, 2, 3].[1]
puts arr.[2]
arr = arr.[3]
arr << 4
puts arr

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

Afreeze

Bfrozen?

Cdup

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to modify the frozen array directly without duplication.

Freeze the array, check if frozen, then duplicate it to modify safely.