Proc creation and call in Ruby - Mini Project: Build & Apply

Proc creation and call

📖 Scenario: Imagine you are building a simple calculator that can perform different operations. You want to use Ruby's Proc objects to store these operations and call them when needed.

🎯 Goal: Create a Proc that adds two numbers, store it in a variable, and then call it to get the result.

📋 What You'll Learn

Create a Proc that takes two numbers and returns their sum.

Store the Proc in a variable called add_proc.

Call the add_proc with the numbers 5 and 7.

Print the result of the Proc call.

💡 Why This Matters

🌍 Real World

Procs let you store blocks of code to reuse later, like saving a recipe to cook anytime.

💼 Career

Understanding Procs helps in Ruby programming for flexible and reusable code, common in web development and automation.

1

Create a Proc that adds two numbers

Create a Proc called add_proc that takes two parameters a and b and returns their sum.

Ruby

# Create a Proc called add_proc that adds two numbers
# Your code here

Need a hint?

Use Proc.new { |a, b| a + b } to create the Proc.

2

Call the Proc with two numbers

Call the add_proc with the numbers 5 and 7 and store the result in a variable called result.

Ruby

add_proc = Proc.new { |a, b| a + b }
# Call add_proc with 5 and 7 and store in result
# Your code here

Need a hint?

Use add_proc.call(5, 7) to call the Proc.

3

Print the result

Print the value of the variable result using puts.

Ruby

add_proc = Proc.new { |a, b| a + b }
result = add_proc.call(5, 7)
# Print the result
# Your code here

Need a hint?

Use puts result to print the sum.

4

Use the Proc with different numbers

Call the add_proc with the numbers 10 and 15 and print the result directly using puts.

Ruby

add_proc = Proc.new { |a, b| a + b }
result = add_proc.call(5, 7)
puts result
# Call add_proc with 10 and 15 and print the result
# Your code here

Need a hint?

Use puts add_proc.call(10, 15) to print the new sum.