Comparable module usage in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to include the Comparable module in the class.

Ruby

class Box
  include [1]
end

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AComparable

BEnumerable

CKernel

DMath

Attempts:

3 left

💡 Hint

Common Mistakes

Including Enumerable instead of Comparable

Forgetting to include any module

Including unrelated modules like Math

The Comparable module must be included to enable comparison operators.

2fill in blank

medium

Complete the code to define the <=> method for comparing boxes by volume.

Ruby

class Box
  include Comparable

  def initialize(length, width, height)
    @length = length
    @width = width
    @height = height
  end

  def volume
    @length * @width * @height
  end

  def [1](other)
    volume <=> other.volume
  end
end

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Aequals

Bcompare_to

C<=>

Dcompare

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names like compare or equals instead of <=>

Not defining the <=> method at all

The <=> method is the spaceship operator used by Comparable to compare objects.

3fill in blank

hard

Fix the error in the comparison method name to enable Comparable functionality.

Ruby

class Box
  include Comparable

  def initialize(size)
    @size = size
  end

  def [1](other)
    @size <=> other.size
  end

  protected

  attr_reader :size
end

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Acompare

Bequals

Ccompare_to

D<=>

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like compare or equals

Misspelling the <=> operator

The method must be named <=> for Comparable to work correctly.

4fill in blank

hard

Fill both blanks to create a hash mapping box volumes to their sizes, filtering volumes greater than 100.

Ruby

boxes = [Box.new(2, 3, 4), Box.new(5, 5, 5), Box.new(1, 1, 1)]
volume_map = {box.[1] => box.[2] for box in boxes if box.volume > 100}

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Avolume

Bsize

Cheight

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using attributes that don't exist or are unrelated

Mixing up keys and values

The hash keys are volumes and values are sizes, filtered by volume > 100.

5fill in blank

hard

Fill all three blanks to create a hash of box sizes to volumes, including only boxes with volume less than 50.

Ruby

boxes = [Box.new(1, 2, 3), Box.new(2, 2, 2), Box.new(3, 3, 3)]
result = {box.[1] => box.[2] for box in boxes if box.volume [3] 50}

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Asize

Bvolume

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators

Swapping keys and values

The hash maps sizes to volumes for boxes with volume less than 50.