Practice using dispatch queues to download and display images, through a hands-on challenge.
This is a companion discussion topic for the original entry at https://www.kodeco.com/9461083-ios-concurrency-with-gcd-and-operations/lessons/5
This is a companion discussion topic for the original entry at https://www.kodeco.com/9461083-ios-concurrency-with-gcd-and-operations/lessons/5