Any?, all?, none? predicates in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if any number in the array is even.

Ruby

numbers = [1, 3, 5, 6, 7]
result = numbers.[1]? { |n| n.even? }
puts result

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

Aselect

Ball

Cnone

Dany

Attempts:

3 left

💡 Hint

Common Mistakes

Using all? instead of any? which checks all elements.

Using none? which checks if no elements match.

The any? method returns true if at least one element meets the condition.

2fill in blank

medium

Complete the code to check if all words in the array start with a capital letter.

Ruby

words = ["Apple", "Banana", "Cherry"]
result = words.[1]? { |word| word[0] == word[0].upcase }
puts result

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

Anone

Ball

Cany

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using any? which returns true if just one element matches.

Using none? which returns true if no elements match.

The all? method returns true only if every element meets the condition.

3fill in blank

hard

Fix the error in the code to check if no numbers in the array are negative.

Ruby

numbers = [0, 1, 2, 3]
result = numbers.[1]? { |n| n < 0 }
puts result

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

Aany

Ball

Cnone

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using any? which returns true if any element matches.

Using all? which requires all elements to match.

The none? method returns true if no elements satisfy the condition.

4fill in blank

hard

Fill both blanks to create a hash of words and their lengths, including only words longer than 3 letters.

Ruby

words = ["cat", "elephant", "dog", "lion"]
lengths = { [1] => [2] for word in words if word.length > 3 }
puts lengths

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

Aword

Bword.length

Cword.size

Dword.upcase

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.upcase as a key or value incorrectly.

Using word.size instead of word.length (both work but only one is correct here).

The hash keys are the words, and the values are their lengths using word.length.

5fill in blank

hard

Fill all three blanks to create a hash of uppercase words and their lengths, including only words longer than 3 letters.

Ruby

words = ["cat", "elephant", "dog", "lion"]
lengths = { [1] => [2] for word in words if [2] [3] 3 }
puts lengths

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

Aword.upcase

Bword.length

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > in the condition.

Using word instead of word.upcase as keys.

The keys are uppercase words, values are their lengths, and the condition filters words longer than 3 letters.