Syntax - Tasty Web Development Treats

771: Promises: Error Handling, Aborts, and Helper Methods - Part 2

May 20, 2024

21:06

Snipd AI

In this podcast, they discuss error handling, abort signals, and essential helper methods in promises. Topics include cancelling promises, using abort signals for performance, promise.all vs promise.allSettled, promise helpers like finally, any, and race, and error handling strategies. They also touch on static promise methods and advanced promise handling techniques in JavaScript.

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Podcast summary created with Snipd AI

Quick takeaways

Controlling promises through resolve or reject methods allows for precise management of success and failure outcomes, including setting timeouts and specific logic for handling scenarios.

Utilizing Promise.all and Promise.allSettled offers unique ways to handle multiple promises, while Promise.finally ensures post-resolution or rejection tasks are executed, enhancing promise functionality.

Deep dives

Controlling promises: Canceling and managing promises

Within promises, the ability to cancel a promise or control its actions is highlighted. By calling a promise back and utilizing resolve or reject methods, you can dictate when a promise succeeds or fails. This control extends to setting timeouts for promises and including specific logic to handle various scenarios, such as automatically rejecting a promise after a certain period or conditions. Additionally, using resolvers externally from the promise itself can facilitate passing success and cancellation functions to other components.

Introduction

2min

Mastering Promise Control and Aborting Requests

8min

Exploring Promise Functions in JavaScript

2min

Effective Error Handling in Promises

5min

Exploring Advanced Promise Handling Techniques in JavaScript

4min

We’re diving into part 2 of our 3-part series on Promises, focusing on error handling, aborts, and essential helper methods. We’ll explore how to manage errors effectively and improve performance with abort signals. Let’s get into it!

Show Notes

00:00 Welcome to Syntax!
00:41 Brought to you by Sentry.io.
02:00 Cancelling promises.
05:16 Why would you reach for an abort signal?
06:26 Promise helpers.
- 07:04 Promise.all() vs Promise.allSettled().
- 09:12 promiseInstance.finally()
- 09:26 Promise.any() and Promise.race()
12:08 Error handling strategies.
- Tuple await-to-js.
- Youtube - 5 Async + Await Error Handling Strategies.
17:30 Promise.race() example.
18:54 Static Promise.reject() and .resolve() methods.