How to Use Javascript Promises

This screencast explains the Javascript Promise pattern at a very high level. Promises are a fundamental tool for modern Javascript development, but it's easy to get overwhelmed when first starting out.

All of the code is pseudo-code meant to make the concept of Promises easier to understand. In a real code base you probably want to use a promise library such as Q or Bluebird instead of using the native Javascript deferred object.

[yevgeniyaterlyuk]

7 years later, this is still the best explanation on promises. Thank you!

[capcadoi]

It takes a special kind of intellect to explain a complicated abstract notion properly. You sir are the best I've seen.

[harikumar-cqje]

Waaaav, what an explanation! Only a few people on this planet can explain some things better. This video has finally cleared my question which I am having for a long time. God bless you.

[foxtools]

Watched a bunch of videos and still had no idea what Promises were and how they worked. Watched YOUR video and I GOT IT!!!! You did a spectacular job explaining how it worked and how to use it in different situations. Thank you for you video.

[DEVDerr]

Absolutely the best promise explanation I've ever seen so far. Congrats man!

[dorjeetsering]

You explained the whole deferred and promise thing in such a simple way. Thank you sir. Though some of the methods used are obsolete now, but is a good stepping stone to understand the new style.

[mapzitm]

This is simply the best tutorial on promises on the whole net! Thank you very much!

[WholeNewLevel]

awesome explanation .... most people explain promises in very dry and abstract manner.... what make this tutorial standout is will thought off real world uses of promises and the examples .... this indeed the best video on promises out there thanks so much and please keep up ....

[kanishkasinghal]

The most thorough yet succinct explanation

[bruceweng]

OMG this is the best promise tutorial I have ever seen!
Thank you so much~

[nikhilverma]

Never saw any video explain such concepts so effectively before. Subbed and liked.

[Santanaebay]

Dude this is the best explanation on promises I have ever seen.

[jacobcoles]

Thank you! Most resources don't explain the structure behind the Promise object as you have done. 11/10.

[huibinma]

you have done the best explanation of promise I have seen so far!! Thank you so much!!

[officially_leema]

6:07 The way you explained this piece, that the resolve is updating the value property just helped fill another gap in my understanding of promises. I'm still watching but i just wanted to note, because that was a super "Aha moment" for me, thankyou!

[zaheeryakub]

Jordon, this is the best explanation, someone ever gave me.You are insanely brilliant.

[imfakeid]

by far the best explanation on promises !!!!

[LewizW]

This is a great explanation. It was nice to see real life examples

[KaraMedema]

I was having a hard time wrapping my brain around promises until I watched this video. Thank you for the great explanation!

[barkgj]

Impressive how well you explained the concept of JS promises in such an easy-to-understand way, kudos to you!