Mapped Types - Advanced TypeScript

In this video I'll explain how to create and use Mapped Types in TypeScript.
00:28 A simple example
02:59 Create a new type based on an existing object type literal (using keyof to get properties of a type)
05:14 Recreating the Pick type
07:19 Explaining how mapped type is used by Record type
09:05 Difference between an interface with an index signature and the Record type
11:12 How to add a specific property to a mapped type?
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[@anuragrai5631]

This is the one of the best explanations regarding advanced typescript concepts No one likes you explain this on KZbin ever thanks a lot sir.

[@samelie]

Thank you for these! Great teacher and hacker! Understanding the composability of Typescript is key to writing less of it

[@renisoncrawford9611]

Wow! Speechless... Your tutorial is a work of art that is crafted to perfection. Thank you for taking the time and sharing your talent with the world.

[@vaylinne6093]

Being pointed to useful typing declarations sure saves a lot of time compared to digging through the entire Typescript documentation, thanks :3

[@inaccessiblecardinal9352]

Excellent work. Ran into Records for exactly the limitation of [key: ?]. I don't have a lot of use cases for the generality of keys, so I worked around it and forgot that it bugged me! Thanks for the deeper dive.

[@imsarvesh_]

Man your videos are on another level. Fews videos on this channel are so advance, that I need to watch several times..

[@pragmaticivan]

Keep it up! Pretty good content! Thanks for taking the time to record those videos!

[@YonathanBenitah]

I like how you are teaching. Very clear... Thank you

[@TheAUa]

Nice and very good to understand. Finally I have the chance to get into TypeScript magic...

[@shahid13384]

You are very clear in your thoughts and so as conveying it to others. Great content with easy explanation. Thank you!

[@DmytroDanylov]

Thank you

[@Rokovbabca]

Clean and easy to understand. Gj!

[@SimonProductionsTM]

Thanks for the explanation. Great video overall :o.

[@borasumer]

Thanks mate, excellent tutorial. Instantly subscribed.

[@dawid_dahl]

Awesome, thank you! 🙏🏻

[@mykyta-maria]

Чудове, послідовне пояснення!) Дякую!) Підписався на канал :)

[@mehmatrix]

Brilliant explanation. Subscribed :)

[@yuensc196]

great teaching

[@andreicristea997]

Thank you Dimitrii. Only now I had on a project @ts-ignore statement and could overcome it with your Mapping Types Solution. Really it made the code look so nice and persistent now. Awesome!

[@DmytroDanylov]

Thank you too Andrei for sharing your experience and letting me know that my tutorial was useful :)

[@fazex4185]

Спасибо. Очень хорошо объяснили.

[@rostyslav5334]

Дуже корисні ТS серії, дякую!

[@casual_sky2]

Thank you for making this! I've learned so much. Can you please do a deep dive into Generics? What you can and can't do with them, interfaces with generic member functions and such? I'm really struggling getting things to work and I can't find videos going deep into them.

[@DmytroDanylov]

Thank you for your feedback! I’m not sure if I’ll make a video about generics soon. Though, generics is one of the topics that I might cover in the future.

[@bstrnx]

I'm subscriber 1000!

[@abdremo]

excellent

[@shensean1784]

thank u.

[@markstone9112]

Чувак, ти крутий ❤

[@DmytroDanylov]

Дякую

[@SuperQuwertz]

Damn is this stuff useful. Great explanation!

[@canmertinyo]

thanks

[@maksym7279]

Дякую, Дмитре! В кінці (12:09), через посилання на 2 інші відео зовсім не видно що коїться на екрані.

[@harshtiwari4545]

Is there any way we can do reverse of it …?

[@aram5642]

keyof any is now PropertyKey

[@mikhailkh8560]

Like, share, subscribe! Awesome! Thanks for explanation!

[@user-ue8bh7tj5k]

Mapped Types - это всё ещё самая непонятная для меня тема. Я просто не понимаю как начать думать конвенцией Typescript, чтобы также жонглировать дженериками. Вот например даже на видео есть запись вида , но какие ключи могут быть у "any"? "Any" может же быть чем угодно, хоть числом, у числа нет ключей, но typescript почему то не ругается. Всё это только сбивает и сеет смуту в мою голову. Или вот ещё пример. На видео 7:03 мы говорим, что "a" - это keyof "T", но "T" имеет в себе ещё и "b". Почему Typescript не ругается на отсутствие "b" - мне тоже неведомо. И в процессе я наблюдаю кучу таких вот вещей и нюансов. Надеюсь когда-нибудь я осознаю дух машины Тайпскрипта и посмотрю с недоразумением на прошлую версию самого себя.

[@dixztube]

Great job covering this ! Man i hope your safe its beyond inhuman what those maniacs in russia are doing i feel a sort of kinship with fellow developers and share the passion and investment that comes with sucha wonderful field - it makes me sick what is happening to all people of invaded lands. As an American i just can't comprehend it