Скачать или смотреть How to Make Multiple Async API Calls in React Using .map()

Learn how to effectively handle multiple async API calls in React using the `.map()` function and `Promise.all`.
---
This video is based on the question https://stackoverflow.com/q/62939939/ asked by the user 'Saswata Sundar' ( https://stackoverflow.com/u/2006786/ ) and on the answer https://stackoverflow.com/a/62940011/ provided by the user 'Adam Jenkins' ( https://stackoverflow.com/u/954940/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: React async API call inside .map() function from actions

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Making Multiple Async API Calls in React

If you're working with React and find yourself needing to make multiple API calls based on an array of identifiers, you're not alone. A common challenge for developers new to React is efficiently handling async operations, especially within array methods like .map(). In this article, we’ll break down how you can handle multiple API calls, ensuring your code is clean and functional.

The Problem

As you start working with React JS, you'll often encounter scenarios where you need to fetch data from multiple endpoints. For example, suppose you have a list of identifiers—like "abc" and "xyz"—and you need to call an API for each of these. You might think of using the .map() function, but if you're trying to use async/await directly inside a .map(), you'll run into issues because .map() does not work with await directly.

Here’s a simplified version of a problematic code structure:

[[See Video to Reveal this Text or Code Snippet]]

As you can see, the intention is to execute multiple API calls, but the implementation is flawed.

The Solution

Use Promise.all()

The key to resolving this issue is to leverage Promise.all(). This method allows you to execute multiple promises in parallel and wait for all of them to complete before proceeding. Here’s how you can refactor your code for effective async API calls:

Transform your array: Use .map() to create an array of promises.

Await all promises: Use Promise.all() to await the resolution of all the promises.

Here’s a refactored version of your original action creator:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

Use of Promise.all(): This function takes an array of promises and resolves when all promises have either resolved or one has rejected. This is perfect for your use case, where you want to make multiple API calls.

Error Handling: Including a try/catch block helps you manage any errors that occur during your API calls, making your application more robust and user-friendly.

Dispatching Data: Once all promises resolve successfully, you can dispatch the data fetched from the API calls.

Conclusion

Handling multiple async API calls in React can be streamlined effectively using Promise.all(). This approach not only simplifies your code but also enhances its performance by executing network requests concurrently. As you develop your skills in React, mastering these patterns will serve you well in creating efficient and scalable applications.

By employing these strategies, you can confidently make API calls without the headaches of dealing with async/await limitations in array methods. Happy coding!