Unless for negated conditions in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a message unless the number is zero.

Ruby

number = 5
puts "Number is not zero" [1] number == 0

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Auntil

Bunless

Cwhile

Dif

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' instead of 'unless' will print the message only when number is zero.

Using 'while' or 'until' is for loops, not conditions.

In Ruby, unless is used to run code only if the condition is false. Here, it prints the message unless number == 0.

2fill in blank

medium

Complete the code to skip printing when the word is empty using unless.

Ruby

word = "hello"
puts word [1] word.empty?

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Aif

Bwhile

Cuntil

Dunless

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' will print only when the word is empty, which is the opposite of what we want.

Using 'while' or 'until' is for loops, not conditions.

The unless keyword runs the code only if the condition is false. Here, it prints word unless it is empty.

3fill in blank

hard

Fix the error in the code by choosing the correct keyword to print unless the number is negative.

Ruby

number = 3
puts "Positive or zero" [1] number < 0

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Aunless

Bif

Cwhile

Duntil

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' will print only when the number is negative, which is wrong here.

Using 'while' or 'until' is for loops, not conditions.

Using unless here means the message prints only if the number is NOT less than zero (i.e., zero or positive).

4fill in blank

hard

Fill both blanks to create a hash with words as keys and their lengths as values, but only for words longer than 3 letters using unless.

Ruby

words = ["cat", "elephant", "dog", "lion"]
lengths = {}
words.each { |word| lengths[word] = word.length [1] word.length [2] 3 }

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Aunless

B>

C<=

Dif

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' instead of 'unless' changes the logic.

Using '>' instead of '<=' in the condition will include wrong words.

The code uses unless with the condition word.length <= 3 to include only words longer than 3 letters.

5fill in blank

hard

Fill all three blanks to create a hash with uppercase words as keys and their lengths as values, but only for words not empty using unless.

Ruby

words = ["", "apple", "", "banana"]
result = {}
words.each { |word| result[word.[1]] = word.[2] [3] word.empty? }

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Aupcase

Blength

Cunless

Dif

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' instead of 'unless' changes the logic.

Forgetting to convert words to uppercase.

The code uses unless to skip empty words, and stores uppercase words as keys with their lengths as values.