Why Ruby has multiple control flow styles - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a simple loop.

Ruby

for i in 1..[1]
  puts i
end

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A7

B3

C10

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a range that ends too high or too low.

The range 1..5 includes numbers from 1 to 5, so the loop prints these numbers.

2fill in blank

medium

Complete the code to use an 'if' statement to check if a number is even.

Ruby

number = 4
if number [1] 2 == 0
  puts "Even"
end

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A%

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition or subtraction instead of modulo.

The modulo operator % gives the remainder. If number % 2 == 0, the number is even.

3fill in blank

hard

Fix the error in the 'case' statement to match the variable 'grade'.

Ruby

grade = 'B'
case [1]
when 'A'
  puts 'Excellent'
when 'B'
  puts 'Good'
else
  puts 'Try again'
end

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Aresult

Bscore

Cgrade

Dmark

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not exist or is unrelated.

The case statement must check the variable grade to match the when clauses.

4fill in blank

hard

Fill both blanks to create a hash with word lengths for words longer than 3 characters.

Ruby

words = ['cat', 'house', 'tree', 'a']
lengths = {}
for word in words
  if word[1] [2] 3
    lengths[word] = word[1]
  end
end

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A.length

B>

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect comparison operators or forgetting the length method.

Use .length to get the length of the word and > to check if it is greater than 3.

5fill in blank

hard

Fill all three blanks to create a hash of uppercase words and their lengths for words longer than 2 characters.

Ruby

words = ['dog', 'apple', 'it']
result = {}
for word in words
  if word.length [3] 2
    result[[1]] = [2]
  end
end

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Aword.upcase

Bword.length

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up keys and values or using wrong comparison operators.

The key is the uppercase word using word.upcase, the value is the length word.length, and the condition checks if length is greater than 2.