Why error handling uses rescue in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to handle errors using rescue.

Ruby

begin
  puts 10 / [1]
rescue ZeroDivisionError
  puts 'Cannot divide by zero'
end

Drag options to blanks, or click blank then click option'

A0

Bnil

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-zero number does not cause an error.

The rescue block catches the ZeroDivisionError when dividing by zero.

2fill in blank

medium

Complete the code to rescue from a generic error.

Ruby

begin
  file = File.open('missing.txt')
rescue [1]
  puts 'File not found'
end

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AArgumentError

BStandardError

CFileNotFoundError

DErrno::ENOENT

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic error like StandardError does not specifically catch file errors.

Errno::ENOENT is the error raised when a file is not found in Ruby.

3fill in blank

hard

Fix the error in the rescue syntax.

Ruby

begin
  num = Integer('abc')
rescue [1]
  puts 'Invalid number'
end

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ANameError

BSyntaxError

CArgumentError

DTypeError

Attempts:

3 left

💡 Hint

Common Mistakes

Using SyntaxError or TypeError which are not raised here.

ArgumentError is raised when Integer conversion fails due to invalid input.

4fill in blank

hard

Fill both blanks to handle division errors and print a message.

Ruby

def divide(a, b)
  a / b
rescue [1] => e
  puts "Error: #{e}"
  return [2]
end

Drag options to blanks, or click blank then click option'

AZeroDivisionError

Bnil

CTypeError

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Returning nil instead of a number.

ZeroDivisionError is rescued and method returns 0 as fallback.

5fill in blank

hard

Fill all three blanks to rescue multiple errors and print custom messages.

Ruby

begin
  puts 10 / [1]
  file = File.open('data.txt')
rescue [2] => e
  puts "Division error: #{e}"
rescue [3] => e
  puts "File error: #{e}"
end

Drag options to blanks, or click blank then click option'

A0

BZeroDivisionError

CErrno::ENOENT

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing error classes or using wrong divisor.

Dividing by 0 raises ZeroDivisionError, missing file raises Errno::ENOENT.