JavaScript Web Workers Explained
HTML-код
- Опубликовано: 22 янв 2022
- A Web Worker is a script that runs in a background threads, separate from the main thread. Web workers enable the browser to execute multiple threads of JavaScript in parallel with each other. The worker thread can perform tasks without interfering with the user interface. Once created, a worker can send messages to the JavaScript code that created it by posting messages to an event handler specified by that code (and vice versa).
📚Materials/References:
MDN Web Docs: developer.mozilla.org/en-US/d...
🌎 Find Me Here:
Twitter: / realdevsage
Ebooks: payhip.com/devsage
Discord: / discord
Merch: cottonbureau.com/people/devsage
💙 Twitter: twitter.com/realDevSage
📙 Ebooks: payhip.com/devsage
💥 Discord: discord.gg/BP8wPv6raA
👕 Merch: cottonbureau.com/people/devsage
Your way of explaining is probably the best I've seen on RUclips. Your video on a certain concept pretty much leaves me with no questions to ask about it.
This comment made me smile. Yeah I try to set my videos apart by making them as simple as possible, ironically. Some other teachers I've seen on RUclips are REALLY smart and knowledgeable about programming topics but are lousy communicators so the overall message gets lost and the tutorial becomes of little value.
I love your approach of explaining in a short consice and a simple manner. Thank you now I have an understanding of web workers. ❤️
You're very welcome!
Wow this is a great tutorial. I have seen like 20 videos of you in last 2-3 hours, your explanations are super easy to understand. Can you please also make a video on use cases distinguishing web worker vs service worker and web scokets?
I am confused which one to be used for what type of use cases?
A lot of these videos have been super helpful! Good length, good explanations. Thanks dude! Keep it up!
Glad you like them!
I've never heard about web workers before, this is interesting, thank you so much.
You're welcome!
Best explanation I've heard yet. I'm ready to code some workers now. 👍
Feels lucky I discovered your channel
Thank you man, it was an intro of basics , but it was useful, it introduced me to the main concept of Web Worker API
No problem
clear and informative with an example. Thank you so much.
Short and to the point. Great explanation thanks man. new subscriber notification up.
this is so helpful especially for a beginner
Nice example demo. Works perfectly.
great, I wonder if i can inject worker as code from server to hide my logic from public but still using client computation power
You Sir are a true hero. Thanks for this!
Great explainer video. Loved the way you demonstrated. For your next videos can I request some things I often confuse with "web workers"?
Service workers
Web sockets
Web components
That was sooooooooo clear and straight .
Thank you very much
You're welcome!
Very clearly explained! Thank you for sharing.
Thank you for explaining this. It was very helpful!
Glad it was helpful!
Please do a video explain about service worker :) Great video by the way
I will put it on my radar
Yes, please!
Thank you. Very well explained 👍
Simple, Short and Clean 👍👍👍
Thanks!
What if you need web workers to do multiple tasks and in different js files, how will they distinguish between msgs they pass among themselves. Like there is no indication apart from where it's called an instance of worker can have different name, but inside worker.js file how will they distinguish between multiple functions (performing different tasks)
Brilliantly explained, thank you!
Glad it was helpful!
you just earned yourself a subscriber. well done!
So very well explained, thanks.
No problem
Simple and Perfect
Keep it up!!
super awesome explanation, man 👍👏
Nice job boy , Thank you so much 🌹
Good work man, it really helped
Glad it helped
Very lucidly explained!! Thank you....
You're welcome!
Great video thanks! that helped me to understand web workers for the first time.
Could you please also make a video about promise, I still don't know if there is any background work going on with promises,
or is await promise also being performed on the main thread, blocking it until the promise is finished?
I do have videos on Promises and also await/async. Yes when you await a Promise you're effectively blocking the main thread of execution until that promise resolves (or rejects)
Amazing explanation man !!
Appreciate it!
Great video. Thanks a lot, man
You're welcome
i couldnt finish reading it but the first 2 sentences were inspirin LMAO
great video thanks! :)
Thank you for your work!
My pleasure!
What the perfect explanation! Thank you for that! :)
So technically said workers are calculated on a "virtual" threads of JS-engine, not on real CPU threads/cores?
Glad it helped! According to the Mozilla docs, workers are spawned using "real OS-level threads"
developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers#about_thread_safety
@@DevSage that's nice to know it! Thank you for the reply :)
Great explanation !
Thank you!
Yep - great stuff - subscribed.
thank you so much for your sharing.
You're welcome!
Thank you!
Great video!
I would like to know why don’t you save the worker listener inside the onClick function
Because I didn't find it necessary
Is it possible to pass the function and the params to the worker file and return the result ? So it can be versatile..
Very helpful, thnx
No problem!
Awesome man 👍
Thanks
Thank you :)
Thank you)
Awesome!!
Thanks!
but what happen if I tell the worker to do some heavy stuff before it has finished previous heavy stuff?
Hi patrick, so web workers seems to be look like (async/await or promises) concept. eventually we defer specific task/s since it takes long time of response while in the same time we complete the other tasks so that we don't waste time in waiting.
It is obvious that the main goal of these techniques is to control the outcome and performance of the application but I would like to see more details on the web workers and async/await concepts in real life example.
Sync = Action A .. wait for the results of (A)
Async = Action A .... wait for the results of (A) and keep doing other actions of (B), (C) and(D)
This is how I understood Sync/Async/Web Workers .... Am I right ?
Yes, the underlying idea is all the same. Synchronous work is "blocking" while asynchronous work is "non-blocking"
nice explain
Solid example
Hey man thanks for the tutorial. I am getting an error for Worker constructor when I use it like this. It is not defined for me. Also, if I use the new syntax where you put in url in the constructor like this:
```
new Worker(new URL('path'), import.meta.url)
```
I dont get any errors like this but in this case, when I specify the onmessage function in the worker script, self and onmessage are both undefined again. Any ideas?
The first parameter of the Worker constructor should be a string
@@DevSage it is a string :/
Thanks!
I really appreciate that Omar!
Great video
Thanks Caleb
Super cool
Thanks Mircea!
can I use it in react?
Nice
how to use it in ReactJS project?
Not readable on smartphones :'-(
Classic
Great. And please stop repeating that javaScript is "single threaded" JavaScript is not single threaded. This is only confusing new comers.
So are you saying that the developers at Mozilla are incorrect? developer.mozilla.org/en-US/docs/Web/JavaScript
this is so helpful especially for a beginner
Great explanation!
Thanks!