Thread creation and execution in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new thread that prints 'Hello from thread!'.

Ruby

thread = Thread.[1] do
  puts 'Hello from thread!'
end
thread.join

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

Acreate

Bnew

Cstart

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using Thread.start which does not exist

Using Thread.run which runs the current thread

Using Thread.create which is not a Ruby method

In Ruby, Thread.new creates a new thread and starts it immediately.

2fill in blank

medium

Complete the code to wait for the thread to finish before continuing.

Ruby

thread = Thread.new do
  puts 'Working in thread'
end
[1]

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

Athread.join

Bthread.wait

Cthread.sleep

Dthread.stop

Attempts:

3 left

💡 Hint

Common Mistakes

Using thread.stop which pauses the thread

Using thread.wait which does not exist

Using thread.sleep which pauses the current thread

thread.join waits for the thread to finish before the main program continues.

3fill in blank

hard

Fix the error in the code to properly create and start a thread that prints numbers.

Ruby

thread = Thread.[1] do
  3.times { |i| puts i }
end
thread.join

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

Arun

Bstart

Cnew

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using Thread.start which is not a Ruby method

Using Thread.run which runs the current thread

Using Thread.create which does not exist

The correct method to create and start a thread is Thread.new.

4fill in blank

hard

Fill both blanks to create a thread that prints squares of numbers from 1 to 3 and waits for it to finish.

Ruby

thread = Thread.[1] do
  (1..3).each { |n| puts n[2]2 }
end
thread.join

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

Anew

B**

C*

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of ** for exponentiation

Using Thread.start which does not exist

Thread.new creates the thread, and ** is the exponent operator to square numbers.

5fill in blank

hard

Fill both blanks to create a thread that prints uppercase letters from an array and waits for it to finish.

Ruby

letters = ['a', 'b', 'c']
thread = Thread.[1] do
  letters.each { |letter| puts letter.[2] }
end
thread.join

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

Anew

Bupcase

Ccapitalize

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using capitalize which only capitalizes the first letter

Using start which is not a Ruby method for threads

Thread.new creates the thread, upcase converts letters to uppercase, and join waits for the thread to finish.