Truthy and falsy values (only nil and false are falsy) in Ruby - Mini Project: Build & Apply

Truthy and falsy values (only nil and false are falsy)

📖 Scenario: Imagine you are checking a list of items to see which ones are considered true or false in Ruby. In Ruby, only false and nil are treated as false in conditions. Everything else is true.

🎯 Goal: You will create a list of different values, then write code to check which values are truthy or falsy according to Ruby's rules, and finally print the results.

📋 What You'll Learn

Create an array called values with specific elements

Create a variable called falsy_values to hold falsy items

Use a for loop with variable value to check each item

Print the falsy_values array at the end

💡 Why This Matters

🌍 Real World

Understanding truthy and falsy values helps when writing conditions in programs, like deciding if a user input is valid or if a feature should run.

💼 Career

Many programming jobs require knowing how different values behave in conditions to avoid bugs and write clear code.

1

Create the list of values

Create an array called values with these exact elements: false, nil, 0, "" (empty string), [] (empty array), and "hello".

Ruby

# Create the array called values with the given elements
# Your code here

Need a hint?

Remember to use square brackets [] to create an array and separate items with commas.

2

Create a variable to hold falsy values

Create an empty array called falsy_values to store values that are falsy.

Ruby

values = [false, nil, 0, "", [], "hello"]
# Create an empty array called falsy_values
# Your code here

Need a hint?

Use [] to create an empty array.

3

Check each value and collect falsy ones

Use a for loop with variable value to go through each item in values. Inside the loop, use an if statement to check if value is false or nil. If yes, add value to the falsy_values array.

Ruby

values = [false, nil, 0, "", [], "hello"]
falsy_values = []
# Use a for loop to check each value
# Your code here

Need a hint?

Use for value in values to loop. Use if value == false || value == nil to check falsy values. Use << to add to the array.

4

Print the falsy values

Write a puts statement to print the falsy_values array.

Ruby

values = [false, nil, 0, "", [], "hello"]
falsy_values = []
for value in values
  if value == false || value == nil
    falsy_values << value
  end
end
# Print the falsy_values array
# Your code here

Need a hint?

Use puts falsy_values.inspect to print the array in a readable format.