Escape Callback Hell and Enter Callback Heaven with Async/Await

JavaScript relies heavily on callbacks for async functions which leads to the infamous 'callback hell'. ES7 is proposing the use of async/await to avoid this. Node.js has already implemented it in version 7.6. I will show you how you can escape from callback hell and reach callback heaven with async await.

Transcript

1. Escape Callback Hell and Enter Callback Heaven with Async/Await Jennifer Bland
2. Who Am I? www.jenniferbland.com @ratracegrad www.youtube.com/c/JenniferBland jennifer@jenniferbland.com github.com/jenniferbland
3. IN THE BEGINNING or how did we get here
4. The only thing that maters in software is the experience of the user Change How I/O Is Handled
5. Sample Code
6. CHANGE THE INFRASTRUCTURE non-blocking event loop
7. Node.js Design Goals No function should direct perform I/O To receive info from disk, network or other process, there must be a callback Stream everything; never force the buffering of data Have built-in support for important protocols
8. Progression of I/O Handling
9. Sample Code - no waiting
10. Sample Code - callback
11. Sample Code - callback hell
13. Promises
14. Chaining Promises
15. z
16. Async Await Async - declares an asynchronous function Automatically transforms a regular function into a Promise When called async functions resolve with whatever is returned in their body Async functions enable the use of await
17. Async Await Await - pauses the execution of async functions When placed in front of a Promise call, await forces the rest of the code to wait until that Promise finishes and returns a result Await works only with Promises, it does not work with callbacks Await can only be used inside async functions
18. Async/Await Example
19. Async/Await Detailed Example
20. Async/Await Handling Errors
21. Async/Await Handling Errors
22. Async/Await Handling Errors
23. Async/Await Examples
24. Async/Await Examples
25. Async/Await Examples
26. Async/Await Examples
27. Browser Support
28. Who Am I? www.jenniferbland.com @ratracegrad www.youtube.com/c/JenniferBland jennifer@jenniferbland.com github.com/jenniferbland