Method Dispatch in Swift | Static | Dynamic | Message

Method Dispatch directly impacts the performance of the app, yet it gets the least attention.
In this video, I explained what is method dispatch, its types (Direct, Table, Message), witness table, how Swift decides when to use which type of method dispatch and everything else that falls in the scope.

As an implementation of the theory, video shows the comparison between the performance of Static Dispatch and Dynamic Dispatch using test cases (I bet that results will make you think).

For more details, you can refer this document for SIL (Swift Intermediate Language). It’s about how Swift is made.
Try searching ‘dispatch’ in the doc.

You can read about the things that I’ve skipped (due to the length of the video) in this article. It is very descriptive.

Chapters 👇🏼
0:00 Start
0:34 Interview Questions answered in the video
1:28 What is Method Dispatch
3:18 Static (Direct) Dispatch
4:07 Dynamic (Table) Dispatch
5:44 Message Dispatch
6:46 How Swift decides which type to use
8:29 Performance comparison using test cases

[RahulP-go]

Not more, not less, covers everything to the point in less than 12 mins. You have worked hard. Thanks!

[educationplus]

Had this topic on my technical interview, couldn't find a better explanation than your video. Thank yo so much!

[pawanmanjani]

Trust me... Your Awesome... Clear and easy explanation... Keep posting please

[afaaqahmedsaqi]

I watch it twice to get full grasp!
Highly recommended as explaination is crystal clear.

[sarikapaghdal]

your videos are very detailed explained and don't create confusion as you are not going here and there in Xcode!

[SUNIL]

Thank you Pallav for making this video. Your videos help me a lot to understand the concepts. Keep sharing your valuable knowledge with us.

[rehanismail]

technically strong 💪 explanation. I always enjoy your tutorials.

[avantiparanjape]

Great video! A quick snapshot to a topic which can be ignored easily.

[vladlk]

Great explanation and illustrations, thanks!

[ShuklaAmbuj]

Well explained Pallav, just Message Dispatch is not clear compared to other which are really explained very well, thanks for the awesome videos.

[deeprajchowrasia]

Well explained, you should also add the reference of the medium article, it really help me to get more clarity.

[saurabhsierra]

Great...nice ... thanks for this...keep posting knowledgeable articles like this...good work.

[DhavalHNena]

Thanks Pallav for this great content! it really helps understanding such uncommon concepts which is not directly related to day to day programming. Thanks a lot!

[sanjeevreddy]

Thanks for this topic and explaination too

[gamingwithsaanvi]

Very well explained...keep sharing your knowledge, thanks

[puneetpal]

Again many many thanks for such content and beautiful explanation 👏

[harinderrana]

Very well explained and different content from other channels 👍

[arunmalik]

Good Explanation...Have one question?
Why swift using static dispatch in Extension irrespective of value type and refrence type data type?

[sangeethabijoor]

Thank you for this video. Very good explanation

[begumkrkgoz]

Thank you for your efforts. That is very useful and understandable.