Begin/rescue/end blocks in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a block that handles exceptions.

Ruby

begin
  puts 'Hello world'
[1]
end

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

Aensure

Brescue

Ccatch

Dfinally

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ensure' instead of 'rescue' to catch exceptions.

The rescue keyword starts the block that catches exceptions in Ruby.

2fill in blank

medium

Complete the code to print an error message when an exception occurs.

Ruby

begin
  1 / 0
rescue => [1]
  puts "Error: #{e.message}"
end

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

Ae

Berror

Cex

Derr

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names other than 'e' which are not referenced in the code.

The variable e is commonly used to hold the exception object in a rescue block.

3fill in blank

hard

Fix the error in the rescue block to correctly handle exceptions.

Ruby

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

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

AFileNotFoundError

BException

CIOError

DStandardError

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'FileNotFoundError' which is not a Ruby exception class.

StandardError catches the Errno::ENOENT exception for file not found errors in Ruby.

4fill in blank

hard

Fill both blanks to retry the operation if an exception occurs.

Ruby

begin
  puts 'Trying...'
  1 / 0
rescue [1] => e
  puts e.message
  [2]
end

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

AZeroDivisionError

Bretry

CStandardError

Draise

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'raise' instead of 'retry' to repeat the block.

ZeroDivisionError catches the division error, and retry repeats the begin block.

5fill in blank

hard

Fill the two blanks to ensure a message is printed whether or not an exception occurs.

Ruby

begin
  puts 'Start'
  1 / 0
rescue [1] => e
  puts e.message
[2]
  puts 'Always runs'
end

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

AZeroDivisionError

Bensure

Crescue

Dfinally

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'finally' which is not a Ruby keyword.

ZeroDivisionError handles division errors, and ensure runs code always after begin/rescue.