Learn TypeScript Generics In 13 Minutes
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- Опубликовано: 6 июн 2024
- TypeScript Simplified Course: courses.webdevsimplified.com/...
By far one of the hardest TypeScript concepts to understand when first learning TypeScript is generics. They introduce new syntax, new logic, and a new way of thinking all at the same time which is tough to comprehend. In this video I will be breaking down everything you need to know about generics (including advanced generic features).
📚 Materials/References:
TypeScript Simplified Course: courses.webdevsimplified.com/...
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⏱️ Timestamps:
00:00 - Introduction
00:49 - When To Use Generics
02:04 - Generic Function Basics
06:40 - Generic Type Basics
09:24 - Advanced Generic Features
#TypeScript #WDS #TypeScriptGeneric
Very often it feels like - yes its totally clear and so easy - when watching videos like this.
Then we go back to work and in most cases our problems are more complex and they still need some time to get around that barrier in the head and apply what we just have learned.
I tought myself the generic stuff by using it in my daily work and I still keep watching videos like this to learn about the very edgew cases - the smart little things I missed in the documentation documents in the web.
Whenever I find it very hard to grasp a concept, I run to this channel. You are the GOAT
I needed more info on generics and I had already signed up for the react course on webdev. I'm glad I purchased the course on typescript. The extra info in your course was exactly what I needed to guide me through a basic understanding of generics.
This is shortest and the best explanation of generics in TS. Thanks for this Kyle.
I was baffled by Generics in the docs & other tutorials. This is incredibly helpful and clear. Thank you.
Excellent, you honored the "simplified" to your name with this video, really easy to understand this way
This is the shortest and best explanation generic types and functions I've ever saw
Shortest, you sure?
I'm currently learning Typescript and struggled a lot getting used to the syntax and trying to figure out what must be passed in to remove all these errors even though the code is correct with plain react/javascript. Thanks Kyle, this will assist me tremendously going forward.
I enjoyed this. Thanks for clarifying. I actually use this but never knew I was implementing a generic type system.
Learnt new stuff today.
Really need your nextjs course, Kyle!!!
Great video so far! Thanks Kyle as always! 👍
Great video! 👏I have been working with typescript for 3 years (angular) and I didn't even know this generic types possibilities.
I just realised how much i needed this video. Good work.
The best drops of knowledge in video I ever seen! Congratulations, man! And thank you very very much
great video! finally got a better idea on how generics work. I had the basic notion but never understood them like this. They are kinda placeholders for a type(s).
Simply the best explanation of TypeScript generics out there. Kyle, you're a legend. Thanks for making these videos 🙏🏻
Nicely explained, it just fit into my mind. Thanks.😊
Great tutorial. Your explanation is awesome.
Loved your explanation!!! 😁
You are the one of the teacher who I know in RUclips , I did not understand until I watched this video why we needs typescript
You really do the web dev simplified!!!😀
Amazing video... Really helpful!!
Thank you so much, your explanation was really easy and helpful!
Just an amazing 12 minutes of content. Thank you so much
This video is a great introduction to generics! Generics can be a confusing topic, but this video breaks it down into clear and easy-to-understand concepts. I especially liked the way he showed how to use generics with API responses. This is a common use case for generics, and it was helpful to see how to create a generic API response type that can be reused for different API endpoints.
so amazing! it's really easy to understand 😄
Amazing! Clear and helpful
Love to see you simplifying the crazy webdev today everything build on top of everything. This mess starts to kill me.
Nice clear explanation - so many people get tied up in knots trying to explain generics.
best webDev channel. Thanks)
Very good introduction. One thing I would recommend for people just starting to learn this, do not even start naming generic parameters with single letters, be expressive. You may start out with a simple type where it's clear what 'T' is, but after a few weeks it has T, R, E, O and W. And a month later you have no idea any more what each of the letters are supposed to mean.
short and concise, i always come back to refresh my memory
Thank you very much for always simplifying very well this kind of typescript concepts :D
Wow, this is the first time I feel like I understand what Generics type is. BIG THANK YOU!
This was great, now I need to understand when you get to that point where you see stuff like T extende keyof K or something like that
thank you a much, I love your courses
very good stuff, thanks!
Brilliant video, as usual
Probably the best video for generics in youtube. Hats of man.
is it a joke?
@@true227 Why do you think its a joke? Simple explanation.
brother your next level thankyou for all these
Super informative video thanks 👍
Thank you so much, I really appreciate it :)
Great video, thanks for kyle
Cool thumbnail. That was the exact emotions I was going through before seeing this video :) Thank you for the video
Very helpful, Thanks
Thanks a lot for this!
Rally good one .. Keep it up..!!
long time no see Kyle, as always great content. 👍👍👍
Goodness me, and you're not even cutting the video every time! Cheers, mate!
The type system in TypeScript is so much more expressive than other languages. It has great inferencing, keyof for derived types, even ternaries for narrowing/filtering types
You need an expressive type system to support types in a dynamic scripting language.
@@arshiagholami7611actually not, for example python type system is very basic.
@@oscarljimenez5717 python doesn't have a type system. it's a type hint for your IDE.
@@arshiagholami7611 Rust has even more expressive type system than TS, and it's a static typed language
@@ElektrykFlaaj no it doesn't, i've coded in both languages for years and I can tell you typescript's type system is way more complex for obvious reasons. I love rust tho 😇
Great video!
Easy explanation ,Simplified the explanation of generic type easy to understand.
Great video kyle, Please cover keywords like Infer, As and Satisfy in Typescript. Thank you.
perfect , and thanks bro
Man, after watching all kinds of your videos I am now convinced you are the one to explain the monads!
Monads are easy but often over complicated. ruclips.net/user/shortsC2-ljnsckrs?si=cHTDnp5xmdRE_b9f
So good. Ty!
This is super useful for writing clean Typescript code. Thanks for sharing!
it was so fun to watch this
Very helpful ❤
really good explanation
Thank you! You know how to explain
Already good with generics, this is a decent coverage of them.
Great content.
Amazing ❤
great simplification
You sir, are a hero
Amazing!
I like thinkin of generics as just a way to pass in types to a function or another type. kinda like how you’d pass in parameters to a function.
it's been a long time since I've seen you ❤
thank you!!!!!
Thank you for clarifying this!
Thank you very very much for this tutorial! Can you please make a video about differences between Generics and Interfaces? I am pretty new and if someone would ask me to define a type of something, my mind thinks "Interface" at once!
Never used this, but it seems useful.
bro, you just explained it so well! Now I don't hate generics that much. My only issue was that for some reason you need to put generics between the name and the parenthesis. I was trying to use it for svelte 5 props and was doing: let {name} = $props() and had no idea why it wasn't working. fyi you need to do it $props()
I think that choice came from other C-family languages that also use the same syntax for generics, like C# and Java to make it more approachable and intuitive for those developers. But for someone that hasn't worked with strongly typed languages in the past, they are understandably intimidating
Thanks a lot
I have not started watching this but when I saw the video, I said if I don’t understand this concept after watching your videos then I can never understand it from anywhere else. Already seeing positive comments so 😅fingers crossed 🤞
Hey @kyle,
That is an awesome video.
I wanted to point something in your last example regarding object. The value of new Date() would resolve to `object` so that might not work well. I think a more robust definition for an object would be Record or something along those lines. What are your thoughts?
And thanks once again for another great video.
Best Generics explain one of!
you are awesome😇
Ahh generics.... My worst enemy
Right next to regular expressions, no doubt 😉
@@joe-skeenchatgpt used to do it's magic for me on regex
I feel u
Same to you
@@unleash-gamplay dw bro practice makes perfect
Would love to see a video about what stuff makes typescript’s inference not work
Verry nice
Which extension are you using? the one when you Hover shows the ts types passed.
Brilliant
Awesome
Always different ❤
Its a better practice to name your generic arguments prefixed with T, like TModel, TRequest, etc. like we do in C#. Yes it's Hungarian-like but it works well to distinguish generic arguments while keeping them explicit and descriptive.
Hungarian-like. What does that even mean?
@@ivan.jeremic Hungarian notation.
Marking your type in TS with T, makes code messy IMO.
You are a G.
thanks
This was a great explanation thank you very much!
Is Typescript really necessary? I have not wrapped my head around why there is a use to make code more complex just to make sure you are using the correct type of variables. I mean... I know what my variables are intended to be when I create them and when I use them later. So I'm not sure of the whole point of TS.
JSDocs is a good alternative if you feel that way
nice content , I wish you sell your ts course cheaper hence we could buy it my friend 😂
Top. I'm to this day shocked how little attention people give to TS given that we use it everywhere in the professional world. Learning as much of it as possible can make a developer go a long way. The same goes for writing tests.
Great video and explanation as always, I really like your video tutorials... but TS still feels like overkill in most use cases I've seen.
Great video!! Just one question about the last part, is there a way to merge the generic default type with the passed one ? Like Data will always be an abject with status key at least, but i pass a type on variable definition that is an object with name so the variable should have a data key with object containing status and name as value. Is that possible ?
type ApiResponse = { status: number } & T
where T is some object type like { name: string } or whatever, is one way, if I understood you correctly. Should then always have status, and add whatever fields else you want.
@@im-essi hmm I see. Chat GPT gave me this:
type DefaultData = {
status: string;
};
type CustomData = {
data: DefaultData & T;
};
// Example usage
const myVariable: CustomData = {
data: {
status: "success",
name: "John",
},
};
But here he creates a new type for doing that in place of using the type passed at variable definition. I like more your approach, thanks!
Yes, & is the operator for union (this AND that), and | is the operator for intersection (either-or)
Or just use extends:
My favorite part of this video was learning that I've already been using Generics everywhere and had no idea that's what they were called.
At 4:02, you pass to tell it what the generic value passed in should be. Makes sense.
At 4:37, you seem to be passing in... the return type? querySelector, now input is of type HTMLInputElement.
so which is it, the type passed in or a return type?
If you pause at 4:42, you can see that the generic is placed after the semicolon, meaning the return type.
At 4:02, Kyle specifically use the generic for the parameter passed in.
So it can be both. It is just a matter of how and where you define it
The generic type can be used anywhere in the function, either in the input arguments, the return type, or even both. For example:
function foo(a: T) { return "foo" }
function bar(a: T): T { return a }
function getFoo(obj: { foo: T }): T { return obj.foo }
i wish you were a private tutor!
Another generics use is to work with interface, then you can pass any type that respect at minimum the interface structure
Coming from C++, I love everything about TypeScript