Boolean values (true, false, nil) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assign the boolean value true to the variable.

Ruby

is_valid = [1]

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

Anil

Bfalse

Ctrue

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using capitalized True instead of true

Using false or nil instead of true

In Ruby, the boolean value for true is true (all lowercase).

2fill in blank

medium

Complete the code to assign the boolean value false to the variable.

Ruby

is_active = [1]

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

ATrue

Bfalse

Cnil

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using capitalized False instead of false

Using true or nil instead of false

In Ruby, the boolean value for false is false (all lowercase).

3fill in blank

hard

Fix the error in the code by replacing the incorrect nil value.

Ruby

result = [1]

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

Atrue

Bnil

CTrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing nil with false

Using capitalized True or true incorrectly

Here, false is the correct boolean value to use instead of nil if you want a boolean false.

4fill in blank

hard

Fill both blanks to create a condition that checks if a variable is nil or false.

Ruby

if value == [1] || value == [2]
  puts "Value is false or nil"
end

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

Anil

Bfalse

Ctrue

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'None' instead of nil

Using true instead of false

To check if a variable is either nil or false, use both values in the condition.

5fill in blank

hard

Fill all three blanks to create a hash that maps keys to boolean or nil values.

Ruby

status = { success: [1], error: [2], pending: [3] }

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

Atrue

Bfalse

Cnil

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using capitalized True or False

Using strings instead of boolean values

Confusing nil with false

This hash uses Ruby boolean values true, false, and nil correctly.