In a callback-based payments app, you have… - Concurrency

ConcurrencyRazorpay

DispatchGroup fan-out

In a callback-based payments app, you have to build a payment summary after three independent APIs have all finished. Where would you put DispatchGroup's enter and leave so they pair up?

Your answer

ConcurrencyShort answerBasics
When a screen appears you call three APIs in parallel, profile, feed, and notifications, …
#dispatchgroup
ConcurrencyShort answerBasics
You have independent pieces of work A, B, and C. C must run only after both A and B have …
#dispatchgroup
ConcurrencyShort answerBasics
A banking app's home screen has to fetch independent account, card, and notification data…
#fanout

Up next