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Async/Await - JavaScript Tutorial

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Rating: 4.0; Vote: 1

This is an in-depth look at the Async/Await feature in JavaScript. Code: https://github.com/eXtremeXR/Async-Await First, we're going to go through brief history of asynchronous programming in JavaScript and see how it transitioned from callbacks to promises to generators and to finally Async/Await. Then we're going to focus purely on Async/Await and we'll go through a bunch of examples. We'll start off by learning how we can do sequential flow using Async/Await and we'll also see how we need to be careful about error handling. Next, we'll move onto parallel execution. We'll see how we can use Promise.all() function to be able to execute multiple promises in parallel. Again, we'll see why we need to be careful about our error handling. Last but not least, we'll take a look at how we can do iterations with Async/Await. We'll start off with for loop, then move onto forEach, for of loop is going to be next and finally we'll wrap that section with while loop. At the end, we'll do a quick recap of the things we just went through. --Contents -- -- 0:00 - Introduction -- 1:28 - Callbacks Example -- 6:44 - Promises Example -- 9:40 - Async/Await Example -- 13:18 - Coding Examples Begin -- 14:09 - Sequential Example (Naive) -- 19:27 - Sequential Example (Issue) -- 21:18 - Sequential Example (Solution) -- 23:48 - Parallel Example (Naive) -- 27:21 - Parallel Example (Issue) -- 28:58 - Parallel Example (Solution) -- 31:55 - For Loop Example -- 36:49 - ForEach Example -- 40:06 - For-Of Example -- 42:06 - While Loop Example -- 44:03 - Recap Tutorial from CodeWorkr. Check out the CodeWorkr channel for more great tutorials: https://www.youtube.com/channel/UCfYTu_qAO5T7a-8rC_74Ypw
Date: 2022-03-14

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Comments and reviews: 5

Yan
the only useful thing in the video is the promise all function, that actually shows performance benefit. what's the point of using async/await sequencially? take note that it can even degrade performace running sequencially because of the extra overhead.
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christian
the reason i like Traversy Media is because you actually start with him like you write all the functions together you create files together, these ones with pre-existing code is not as fun, but its a cool video anyways, thanks
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Christian
Excellent video! Very well prepared and demonstrated. The little hint about async/await not working with functions using a callback themselves was awesome. That was my main point, why I still struggled. Thanks a lot!
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Varun
I've gone thorough 20-30 videos on async await in the last few days as I am trying to learn JavaScript and Node.js - and hands down this is the best that I've seen for a beginner to learn the concept and build upon it.
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Akash
Great Job!! Can you explain if Data is an array why is it declared as an Const Variable (referencing timer 26:02 seconds)?
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