Truthy and falsy values (only nil and false are falsy) in Ruby - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Ruby code?

Consider the following Ruby code snippet. What will it print?

Ruby

value = 0
if value
  puts "Truthy"
else
  puts "Falsy"
end

A Truthy

B Falsy

C SyntaxError

D nil

💡 Hint

Remember in Ruby, only nil and false are falsy.

In Ruby, 0 is considered truthy, so the if condition passes and prints 'Truthy'.

❓ Predict Output

intermediate

What does this Ruby code print?

Look at this Ruby code. What will be printed?

Ruby

value = ""
if value
  puts "Truthy"
else
  puts "Falsy"
end

A Truthy

B Falsy

C nil

D RuntimeError

💡 Hint

Empty strings are not false or nil in Ruby.

Empty strings are truthy in Ruby, so the code prints 'Truthy'.

❓ Predict Output

advanced

What is the output of this Ruby code with logical operators?

What will this Ruby code print?

Ruby

a = false
b = nil
c = true
if a || b || c
  puts "Truthy"
else
  puts "Falsy"
end

A Falsy

B Truthy

C nil

D SyntaxError

💡 Hint

Only false and nil are falsy; true is truthy.

The expression a || b || c evaluates to true because c is true, so it prints 'Truthy'.

❓ Predict Output

advanced

What does this Ruby code print when using the not operator?

Analyze this Ruby code and determine its output.

Ruby

value = nil
if !value
  puts "Truthy"
else
  puts "Falsy"
end

A nil

B TypeError

C Falsy

D Truthy

💡 Hint

The not operator (!) inverts truthiness.

Since value is nil (falsy), !value is true, so it prints 'Truthy'.

🧠 Conceptual

expert

Which value is falsy in Ruby?

Select the only value that is falsy in Ruby.

A 0

B "false"

C nil

D []

💡 Hint

Only nil and false are falsy in Ruby.

In Ruby, only nil and false are falsy; all other values including 0, empty string, and empty array are truthy.