Promises From Scratch In A Post-Apocalyptic Future

=[ ℹ About ℹ ]=

In this installment of Low Level JavaScript we build a Promise implementation from scratch in order to understand exactly how asynchronous abstractions can be built on top of lower level primitives like callbacks.

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[shanemarchan]

This was an eye opener for me. I've learnt and built software using a vast amount of technologies from node, threejs, react, nextjs, etc.. and I thought I was really comfortable with JavaScript but then this video took me a back, even at first the this.bind(this) was so puzzling to me in this case when ive comfortably used it many times before. If this was an interview question I would have fell flat on my face even as a take home exercise. Majority of youtubers teach how to use concepts you when you can just read the docs but to understand the internal and put it across so nicely you do it so well. I am learning rust and your videos encouraged low level understanding. Hope you continue with these lower level js concepts.

[Hey__Luna__]

That’s the best explanation ever! I heavily commented my implementation of a promise and I cannot thank you enough. Finally I understood what every line of code is doing. Thank you .

[paxdriver]

The best javascript promises video on YouTube hands down

[romulus]

Wow. That's perfect explanation, for sure! Would be great if you could elaborate the event loop in the same manner. Thank you for amazing content!

[Finn-jppn]

My brain always wants to know how things work under the hood. Your channel is an absolute godsent. Thank you, thank you 🙏

[BinaryRx]

This channel is an absolute gold mine, thank you for all your incredible videos!

[amromsteinmetz]

One of the best programming videos I've seen. Thank you, and keep the content coming please!

[Strasbourgeois]

Absolutely fantastic explanation!
Once you understand the mechanism I highly advise you to rewrite everything in a different pattern, like factory for instance. It gives you a slightly different perspective and helps a lot to solidify what you've learned.

[jonfit]

Wonderful tutorial. It is very important to understand how to implement those JavaScript native methods before we take it for granted to use them. Thank you!

[gregfletcher]

I really enjoy your coding style and your explanations. So clear and concise!

[kathrinayer]

I love this channel and this video in particular. I recommend it to anyone who needs to know the "why" as well as the "how" <3

[taskforce_kerim]

Been following your channel almost from the very beginning. You're doing an incredible job! Great stuff.

[iwswordpress]

Excellent explanation of a very difficult concept. Thanks!

[MrAaronBlues]

And from all the sands and all the dust, came to light LLJS - thanks to this Holy Channel ❤❤

[sshh]

can you program the event loop as well?

[bafellah]

A nice explanation, just one point, the executor function passed to the promise run immediately after creating the promise

[modolief]

I love these videos even though they make me feel small.

[jeffreyqiu]

This is a really nice video. Thank you

[tonycash]

So clear and awesome explanation, I really love this

[maximrudenko]

Great content! Excellent explanation! Thank you!