Interview Questions on Concurrency, GCD, Operation Queue | Swift (Mastering Concurrency in iOS - 6)

This is the part 6 of the series "Mastering Concurrency in iOS", and in this part, I've focused on interview questions related to Concurrency.
Being a good developer and cracking the interviews are two different things and requires different skill sets, different preparation. In this video, I've tried to compile the frequently asked questions on Concurrency, their answers and how to prepare for them.

[mattheaney]

Thanks Pallav, this is an incredible series! I picked up so much info on just a watch through, but i'm looking forward to going back through to really lock my understanding of these concepts in. Keep up the awesome work with the videos!

[VinayGupta-vzod]

This mastering concurrency series is awesome. Along with this your mock interview series is too good, in all iCode helped me crack 3 companies and I was able to switch my job and get my concepts crystal clear. Thanks a lot !! 🙏❤️🍎👏

[sumitguptasg]

I couldn't find the iOS data persistence playlist on your channel, if not already created would you consider it next? Thanks.

[MajdurDancer]

Omg❤ i have started following you, and each and every video is too good to understand.
please upload more videos on unit test cases and more tutorials on iOS interviews. It helps the developers like us❤

[namanjain]

Pallav, have a doubt, at 4:50, u told that you are unsure and it is unpredictable to say what will be printed first between 0 to 5 and 10 to 15, but why, here complexity is same, so 10 to 15 should also end first, and queue is FIFO, so why 10 to 15 is not printed first always?

[keerthichinivar]

This is an excellent series I have come across with respect to Concurrency in iO. loved your dedication in covering the details of all the concepts. Looking forward for your upcoming video.

I have a request for you: Can you please do a similar video for Core Data? Encryption of core data, accessing it. Relationship, delete rules and concurrency

[sifatulislam]

I gotta say, your stuff is seriously awesome. It would be even more awesome if we could have more topics on concurrency explored, such as async-sequence, async-stream, async publisher, detached task, continuation, and so on.

[sandeep]

thanks, Pallav for such great content. Using a sample Xcode project(No Playground) with NSLog would be great instead of print. NSlog will clarify which thread is used for which code block or which piece of code is executed on which thread. Any specific reason for using the playground? Meanwhile the output of code used at 4:08 is below, using Xcode project with NSog. its clearly show that async is being executed on a different thread.

2022-11-17 16:27:54.641339+0530 50 51 52 53 54 55
2022-11-17 16:27:54.641878+0530 30 31 32 33 34 35
2022-11-17 16:27:54.641884+0530 10 11 12 13 14 15 // queue.async
2022-11-17 16:27:54.642591+0530 0 1 2 3 4 5 // queue.async

[princepushkraj]

Amazing series buddy, you always make things pretty simple 😀

[rjlove]

@icode - Make more videos, you are a true Gem, You helped many to get good packages in big companies. Kindly create more videos regularly.

[poonamyadav-qzyt]

Hi Pallav, I did not understand why 10..15 will be printed before 0..5? both of them are serial queue and async. so it could be possible that second queues finishes executions of all task first and hence dequed before the first queue and can be printed first. where am I going wrong in my understanding?

[priyeshp]

Think of a serial queue as a single-lane road. On this road, cars (tasks) can only move one after the other. Only when the car in front has reached its destination (task has completed), can the next car start moving (next task can start).

On the other hand, a concurrent queue can be thought of as a multi-lane highway. On this highway, multiple cars (tasks) can move forward at the same time, each in its own lane. They don't have to wait for the car in front to reach its destination (task to complete) before they can start moving (task can start).

Now, consider synchronous (sync) and asynchronous (async) operations as traffic signals. A synchronous operation is like a red traffic signal. When it is encountered, all cars (tasks) must stop and wait until the operation is complete before they can continue(People crossing the road).

An asynchronous operation, on the other hand, is like a green traffic signal. When it is encountered, cars (tasks) can continue moving without having to stop, even if the operation is still in progress(Some road work).

Basic idea can be inferred from the above comparison.

[reddybharadwaj]

Thanks for the content it was on point but there are actually no videos in past months so just wanted to know out of curiosity are you stooping it here or will you start it again it would be great to see your videos again

[anurantheassassin]

Thanks for the video. Will appreciate if same could be done for Core Animation.

[LuizPeres-wp]

you're awesome man, thank you so much for these videos!!

[kelvinfok]

Thank you! The quality of your content is top notch 🎉

[luckymehndiratta]

Greetings of the day

Can you please suggest me a good book for value type and reference type concept in more details. Why there is only these two type reference and where is the start point of these two

[jur]

Glad we now have Tasks, Actors, await, async, swift algoritms..yeah old times..

[nickpatel]

4:51, how you will sure that 0 to 5 must be printed before 10 to15 always as it is async block with concurrent queue?

[maqusss]

Here is a question: whats wrong with code at 8:05 ?