❤Hello again!! It's been a while since I uploaded to my own RU-vid channel haha. 🔊 I'm aware that the audio is a bit low! Sorry about that, will keep this in mind in the future :) I have many ideas for upcoming videos, but let me know in the comments what you think I should cover next! 👇
I don't know if you want to go full time on this, but until then, I'm just so happy you decided to create content. It gives so much clarity on what JavaScript does, especially for people like me, who have aphantasia.
Never seen a video with such clear drawings for explaining JavaScript promises and how they relate to the event driven nature of current JavaScript compilers. You've got a new subscriber!
One of the best explanations I've seen. I'm so glad to see in recent years far better communication of confusing or complex ideas in coding. As an older bearded autistic Linux fan myself, I can confidently say simple communication hasn't traditionally been one of my peer groups strengths 😂. So I am glad my daughter will have far better role models explaining these concepts if she chooses to go into software development.
This was INSANELY well done and highly educational. As someone who felt like I never fully grokked promises, after 4mins of watching a vid I now feel confident in how they fundamentally work. The visuals were amazing, progressive code snippets were perfect, and the script was tight and educational. I love that you basically made a clif notes video for a chunk of EXMA-262!! Insta sub! 👏
Great video as usual! A tiny addition I would make is that the then handler implicitly creates a fulfilled Promise as shown in the video by Lydia if you return a plain value - but the more common case for chaining is that you explicitly return a Promise yourself which usually is pending at first.
just 2 days ago I was thinking about lack of a visualized teaching in javaScript and today I found this channel it's great keep going and keep the level of your videos above I think developer community needs more people like you
Hello Lydia. Thanks for all the videos. I hope we have teachers like you everywhere. Watching your videos gives so deep understanding about the topics. Thanks you so much again!!!
The visualization here is crazy to a point, me- who's very slow to understand, understood every word you said. Please keep doing more of this. I've even subscribed!
Just WOW!!! I have seen dozens of videos on Event Loop, and it made sense to me because some of them does not explain complete event loop. There is a famous video which tells event loop is simply a Stack and a Queue, and which always confused me when working with callbacks or promises. Thankyou very much for the video and looking forward for topics like "Closure".
Well done! this visualization is the best I have ever seen for learning how the code works, plus your explanation is easy to understand kinda whish I had it when I learned promises
Asynchronous programming is one of the most difficult topics to learn for beginners, because it is difficult to visualize in your head the coherent work of the stack, queues, event loop and web API. Thank you for such a clear explanation of how Promises work. I'm waiting for your new videos. Greetings from Russia! 🕊
Love it, strait to the point, useful infographics and efficient plan. I think the format is great. Details on "small" topics give the opportunity to beginners understand concepts and experimented people will always learn 1 or 2 things.
Have been reading your Javascript Visualised series on Medium, you're really underrated. Thank you for making these, hope you continue! Really helpful for beginners
Superbly explained - as someone who hasn't really done much JS for a while and wanting to get back into it these kind of clearly explained resources are so useful 👏⭐
I have a frontend interview after 2 days and this popped up in my feed, thanks youtube, Great visualization of promise, really enjoyed how you explained how things work under the hood in Promise.
Nicely done! I've working with Promises since 2012 or before, but I never understood the details until watching your video in prep for an interview. Thanks!
Hey, it's good to see you on youtube, your visualizations got even better! 😀 Thanks! 💡Maybe execution contexts and closures would be good to cover next.
Really good video. Even though youtube is crowded with Language specific subjects, the quality of this video makes it special. What I don't see a lot in youtube (maybe you can take the challenge) is about programming developing flow and techniques. Once you master the language the big challenge is about the developing process flow. How to decompose a big problem. Where to start. When to be wary about coupling of functions and data structures, how to create functions that have only one responsibility, data structures, simplicity, scope of a function, top-down approach vs bottom-up approach. I think the format for the video could be to create a medium complex project (several videos) and stress good practices and what could have gone wrong, what are the internal thought process that recreated the flow.
Brilliant work!!, explained easily with story + visualizations, thanks Lydia. I hope u continue to make such Visualized videos for advanced concepts for key frontend techs such as JS, TS, ReactJS and NodeJS.
I'm so happy this video exists! I've seen many courses that cover this topic but this one has been the most complete the easiest to understand. please teach us more, can i ask for how heap works in javascript video
I've found this video quite interesting! I already had more or less a clear idea of how promises work, but honestly I didn't know the existence of the microtask queue (I thought all future tasks were added to the same queue). I'll share this video with the developers of my team so they can learn from you too 🙂 thanks for this!
Thanks for uploading this video. Actually when I stated learning JS , I read your writing on MDN about " Promises & Async/Await" then I came to RU-vid if there is any video on this but it was not there. I got a bit disappointed. Now You upload this video. really happy for that. please make more video on JS.
Incredible! I was playing-pausing-testing-playing-pausing as the video went on and ended up writing: function createHandler() { console.log('creating success handler'); return () => console.log('.then Resolved!'); } new Promise((resolve, reject) => { console.log('promise function body'); queueMicrotask(() => console.log('microtask before resolve')); resolve(); queueMicrotask(() => console.log('microtask after resolve')); }).then(createHandler()); console.log('regular call stack'); Before the last part of the video I expected ".then Resolved" to occur before "microtask after resolve"; but the last bit about then-handler not being pushed to the microtask queue until the then actually runs kind of makes sense. I was assuming that the resolve itself would push the microtask.
Masha allah sis!! We need more videos like this. It would be great if you start a full JS playlist for Web Development!! Really looking for it! Your teaching style is just superbbb!!
Hello Lydia! This video was super useful to me! It is always the same, you think you know something until someone shows you that you don't with fancy animations! My two cents on how to improve (it was a super good video btw): Felt that you went a bit fast though, and even though the animation was almost always clear there were sometimes I had to pause and go back to kind of understand what was going on. Other than that, I missed a bit extra explanation on what the call stack, event loop and so on are. Might be a good idea that you make a video on that so you can reference that one in future videos. Keep going, you're doing great!
Great video, it helped me visualize better what is this JS Promises thing about. I'm new to the coding world and this is one of the topics I have not fully grasped yet. I would've loved you explained a little further about what happens when you chain the '.then', are they stacked in the microtasks queue? and what about if it wasn't the end of the script? and what about the reject part of the Promise? and what about the 'await' keyword I often see it is used? Anyway, great video, thank you for sharing! I hope you could clarify all these for those like me that are new to coding, and maybe using some real world scenarios as examples :)
Wonderful explanation!I was puzzled about the inner workings of Axios, and I don't know if I understood it correctly. I would like to see that in your channel if it's possible. 😊❣
The thing that literally blew my mind with promises was that I'd heard FP people go on about "monads" for sooooooo long along with that ridiculous quote designed to intimidate anyone who doesn't understand... I remember after a few weeks of messing around with promises that it suddenly dawned on me that promises in JS were basically monads and my mind was blown not by the fact that my "great mind" had grasped this complex topic but that the complex topic itself was actually really simple. ... I love to troll functional programmers... "oh yeah, I'm a functional programmer too... I use JS" :) :) :) :)
This video is very helpful! But in the challenge, at one point you seem to have an empty call stack while you have a lambda on the microtask queue (viz., `result => console.log(result)`). It has me wondering why that lambda isn't executed before the final `console.log(3)`. Please explain!
