Raise for throwing errors in Ruby - Mini Project: Build & Apply

Raise for Throwing Errors in Ruby

📖 Scenario: You are building a simple program that checks if a user is old enough to access a website. If the user is too young, the program should stop and show an error message.

🎯 Goal: Learn how to use raise in Ruby to throw errors when something goes wrong.

📋 What You'll Learn

Create a variable with the user's age

Create a minimum age variable for access

Use raise to throw an error if the user is too young

Print a success message if the user is old enough

💡 Why This Matters

🌍 Real World

Throwing errors is important in real programs to stop when something is wrong, like invalid user input or missing files.

💼 Career

Understanding how to raise errors helps you write safer code and handle problems clearly, a key skill for any Ruby developer.

1

Set up the user's age

Create a variable called user_age and set it to 15.

Ruby

# Create a variable called user_age and set it to 15
# Your code here

Need a hint?

Use = to assign the value 15 to user_age.

2

Set the minimum age for access

Create a variable called minimum_age and set it to 18.

Ruby

user_age = 15
# Create a variable called minimum_age and set it to 18
# Your code here

Need a hint?

Use = to assign the value 18 to minimum_age.

3

Use raise to throw an error if too young

Write an if statement that checks if user_age is less than minimum_age. Inside the if, use raise with the message "Access denied: You are too young!".

Ruby

user_age = 15
minimum_age = 18
# Add an if statement to raise an error if user_age is less than minimum_age
# Your code here

Need a hint?

Use raise inside the if block to stop the program with an error message.

4

Print success message if age is okay

Add an else block after the if that prints "Access granted: Welcome!".

Ruby

user_age = 15
minimum_age = 18
if user_age < minimum_age
  raise "Access denied: You are too young!"
else
  # Print access granted message
  # Your code here
end

Need a hint?

Use puts to print the welcome message inside the else block.