9 JavaScript Features You’ve Never Used 

An excelent video. One thing to improve it: please split timeline for each tip,whith this avoid memorize timeStart and timeEnd

Timestamps 0:00 Proxy Objects 2:43 Private Fields in Classes 5:00 WeakMap and WeakSet 8:23 Nullish Coalescing Operator and Optional Chaining 10:19 Object.freeze 12:12 BigInt 13:52 Generator Functions 15:27 Symbols 17:45 Tagged Template Literals

Respect for starting right away and not using an overflashy intro

So, here's my list. Proxy - I know, and don't use it, for now. Private - I use it in almost every class. WeakMap/Set - used. Optional chaining - of course, you should have it. Object freezing - I use it quite often. It can speed up read operations on very large amounts of data. Bigint - how can you live without them? Generators - I used them a couple of times for custom iterators. Symbol - I know, I don't use it I've seen that way to work with literals, but I don't use it, it's easier to call fn on the val itself, imho. 7/9 Bonus that I use: void statement (No one was using it, so he was very upset, and I decided to fight this injustice. It also gives a little more information to the compiler) Nullish coalescing and assignment (??=), for example, to make sure that the nested object in my cache exists before I get into it without if (obj[obj] !== undefined)

The best video I have seen for advanced javascript concepts

Finally understand WeakMap. Thank you.

Good reminder to use tagged template literals next time! I've used it thousands of times when using styled components, but never bothered to use it for some string formatting, although it's really neat. Thanks!

Nullish coalescing or optional chaining would be unknown 2-3 years ago, now it's commonly used. But how about "??="? (Nullish coalescing and assignment)

That private field syntax with # is pretty weird. Why not just use a private keyword when defining the property?

Great video. Thank you

Good vid. Thanks.

Gret video. I also commend you for having the thumbnail match what you went over first. As others have mentioned bookmarks/clickable timestamps would be really great.

I have used Proxy in the past but forgot what the use case scenario was, I believe it was for some kind of router or something, but not sure.

Thank you

The Proxy is giving off Immer vibes

I used at least once each of this features, but anyway great video as always

The first use case for proxy that comes to my mind is to make a case insensitive object properties

In wonder if you could use Symbols as React keys when iterating over arrays to guarantee the keys are always unique

well, I saw how the Proxy works, it's time to make my own framework

Why did you have while(true) inside the generator? Is it needed? Thanks

>9 features never used >used every single one at some point Okay

didn't know template literals could be used like that. would've confused the hell out of me if I saw it the first time in the wild lol. i've never seen anyone mentioning it when teaching string interpolation

Ok subscribed.

Theme and font in vscode??

const person = { name: ‘John’, age: 30, obj: { prop: “value” } } as const; …will also make the object read only and you wouldn’t have to do object.freeze for deeply nested objects

Everyone is using Proxy with Vue under the hood 😅 I’ve been using js for 12 years, I used everything listed here😢

This is mind blowing! Without practicing in some projects i will forget about them right after i end the video So you need to create longer video with practice and CHALLENGES and repetition of those things i will watch it 1-2 hour video tutorial using those Without any challenges learning anything is useless

Great video. But, JavaScript does not belong on the server

{2024-06-13}