Block parameters in Ruby - Mini Project: Build & Apply

Using Block Parameters in Ruby

📖 Scenario: You are organizing a small party and have a list of guests with their ages. You want to greet each guest personally and mention if they are an adult or not.

🎯 Goal: Learn how to use block parameters in Ruby to process each item in a list and print customized messages.

📋 What You'll Learn

Create an array of guest names and ages

Use a block with parameters to access each guest's name and age

Print a greeting message for each guest mentioning if they are an adult (age 18 or older) or not

💡 Why This Matters

🌍 Real World

Using block parameters helps process lists of data like guest lists, orders, or records easily and clearly.

💼 Career

Understanding block parameters is essential for Ruby developers to write clean, readable, and efficient code when working with collections.

1

Create the guests array

Create an array called guests with these exact elements: [['Alice', 17], ['Bob', 22], ['Charlie', 15]]

Ruby

# Create the guests array with names and ages
# Your code here

Need a hint?

Use square brackets to create an array of arrays. Each inner array has a name and an age.

2

Set the adult age limit

Create a variable called adult_age and set it to 18

Ruby

guests = [['Alice', 17], ['Bob', 22], ['Charlie', 15]]
# Set the adult age limit
# Your code here

Need a hint?

Just assign the number 18 to the variable adult_age.

3

Use block parameters to greet guests

Use guests.each do |name, age| to loop over the guests array and inside the block, create a variable status that is 'an adult' if age >= adult_age or 'not an adult' otherwise

Ruby

guests = [['Alice', 17], ['Bob', 22], ['Charlie', 15]]
adult_age = 18

# Loop over guests with block parameters and set status
# Your code here

Need a hint?

Use the block parameters |name, age| to get each guest's details. Use a ternary operator to set status.

4

Print greeting messages

Inside the block, add a puts statement to print: "Hello, #{name}! You are #{status}."

Ruby

guests = [['Alice', 17], ['Bob', 22], ['Charlie', 15]]
adult_age = 18

guests.each do |name, age|
  status = age >= adult_age ? 'an adult' : 'not an adult'
  # Print greeting message
  # Your code here
end

Need a hint?

Use puts with string interpolation to print the message.