Why error handling uses rescue in Ruby - See It in Action

Why error handling uses rescue

📖 Scenario: Imagine you are writing a small program that divides two numbers. Sometimes, the second number might be zero, which causes an error. You want to handle this error gracefully so the program doesn't crash.

🎯 Goal: You will learn how to use rescue in Ruby to catch errors and handle them safely.

📋 What You'll Learn

Create two variables with exact values

Add a variable to hold the result

Use begin and rescue to handle division errors

Print the result or an error message

💡 Why This Matters

🌍 Real World

Error handling is important in real programs to avoid crashes and provide helpful messages to users.

💼 Career

Knowing how to use <code>rescue</code> in Ruby is essential for writing reliable and user-friendly applications.

1

Create two variables for numbers

Create two variables called num1 and num2 with values 10 and 0 respectively.

Ruby

# Create variables num1 and num2 with values 10 and 0
# Your code here

Need a hint?

Use = to assign values to variables.

2

Create a variable to hold the result

Create a variable called result and set it to nil to hold the division result.

Ruby

num1 = 10
num2 = 0
# Create a variable result and set it to nil
# Your code here

Need a hint?

Use result = nil to start with no value.

3

Use begin and rescue to handle division

Write a begin block where you divide num1 by num2 and assign it to result. Use rescue ZeroDivisionError to catch division by zero errors and set result to the string "Cannot divide by zero".

Ruby

num1 = 10
num2 = 0
result = nil
# Use begin and rescue to divide num1 by num2 safely
# Your code here

Need a hint?

Use begin and rescue ZeroDivisionError to catch errors.

4

Print the result

Write puts result to display the value of result.

Ruby

num1 = 10
num2 = 0
result = nil
begin
  result = num1 / num2
rescue ZeroDivisionError
  result = "Cannot divide by zero"
end
# Print the result
# Your code here

Need a hint?

Use puts result to show the output.