Ruby - Concurrent Programming
You want to create 3 threads that each print their thread number (1, 2, 3) and then print 'Finished' after all threads complete. Which code correctly achieves this?
You want to create 3 threads that each print their thread number (1, 2, 3) and then print 'Finished' after all threads complete. Which code correctly achieves this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Create threads storing them in an array
threads = [] 3.times do |i| threads << Thread.new { puts i + 1 } end threads.each(&:join) puts 'Finished' correctly creates 3 threads, each printingi + 1(1, 2, 3), and stores them inthreads.Step 2: Wait for all threads to finish before printing 'Finished'
threads = [] 3.times do |i| threads << Thread.new { puts i + 1 } end threads.each(&:join) puts 'Finished' callsthreads.each(&:join)to wait for all threads, then prints 'Finished'. This ensures 'Finished' prints last.Final Answer:
threads = [] 3.times do |i| threads << Thread.new { puts i + 1 } end threads.each(&:join) puts 'Finished' -> Option BQuick Check:
Store threads, join all, then print [OK]
Quick Trick: Join all threads before printing final message [OK]
Common Mistakes:
- Not storing threads to join later
- Printing 'Finished' before threads complete
- Using wrong thread index values
Master "Concurrent Programming" in Ruby
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