How to Receive Async Data as Resolved Values in JavaScript

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How to Receive Async Data as Resolved Values in JavaScript

When working with asynchronous operations in JavaScript, especially in applications built with React, developers often encounter scenarios where they need to handle data returned from promises. If you’re struggling to obtain the resolved values from async functions, you’re not alone. In this post, we will explore a common challenge where you may be trying to read file data and upload it to a server, but are unable to retrieve the data correctly due to handling promises improperly.

Understanding the Problem

Here is a simplified version of what that might look like in a typical scenario:

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

The Challenge

The contents property contains promises instead of the resolved data.

You can't proceed with uploading until you have the actual content data.

The Solution: Properly Handling Async Data

Step-by-Step Solution

Map Over Documents: Instead of directly returning the async results, format the code to collect all promises into one array.

Construct the Upload Object: With the now-resolved values from your async function, construct the objToUpload.

Here’s how you can implement this solution effectively:

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

Explanation of the Code

Awaiting Results: The data variable will hold all the returned objects once the promises have resolved, allowing you to structure your upload request accurately.

Effective Logging: When you log objToUpload, it now reflects the expected structure rather than an array of promises.

Conclusion

If you find yourself dealing with multiple asynchronous calls in your project, remember this pattern for clean and efficient code management!