GIL (Global Interpreter Lock) impact 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.new { puts [1] }

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

A"Hello from thread"

BHello from thread

Cprint 'Hello from thread'

Dputs Hello from thread

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string

Using print instead of puts inside the thread

The string must be inside quotes to be printed correctly.

2fill in blank

medium

Complete the code to start two threads that increment a shared counter.

Ruby

counter = 0
threads = []
2.times do
  threads << Thread.new { counter [1] 1 }
end
threads.each(&:join)
puts counter

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

A+=

B-=

C*=

D/=

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong operator like '-=' or '*='

Not incrementing the counter inside the thread

The counter should be increased by 1 using the '+=' operator.

3fill in blank

hard

Fix the error in the code to safely increment a shared counter using a Mutex.

Ruby

counter = 0
mutex = Mutex.new
threads = []
3.times do
  threads << Thread.new do
    mutex.synchronize { counter [1] 1 }
  end
end
threads.each(&:join)
puts counter

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

A/=

B-=

C*=

D+=

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong operator inside the mutex

Not using mutex to protect the counter

Inside the mutex block, use '+=' to safely increment the counter.

4fill in blank

hard

Fill both blanks to create a hash with word lengths only for words longer than 3 characters.

Ruby

words = ["cat", "house", "dog", "elephant"]
lengths = { word: word.[1] for word in words if word.[2] 3 }

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

Alength

Bsize

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>'

Using 'size' which is valid but not the expected answer here

Use 'length' to get word length and '>' to filter words longer than 3.

5fill in blank

hard

Fill all three blanks to create a hash with uppercase keys and values greater than 0.

Ruby

data = { 'a' => 1, 'b' => 0, 'c' => 3 }
result = { [1]: [2] for k, v in data.[3] if v > 0 }

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

Ak.upcase

Bv

Cselect

Dmap

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'map' instead of 'select' for filtering

Not converting keys to uppercase

Use 'select' to filter, 'k.upcase' for uppercase keys, and 'v' for values.