How to Return a Value from Nested JavaScript Functions

Learn how to effectively return values from nested JavaScript functions, specifically focusing on handling the `onicecandidate` event in WebRTC.
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This video is based on the question https://stackoverflow.com/q/67289823/ asked by the user 'Learner' ( https://stackoverflow.com/u/2071433/ ) and on the answer https://stackoverflow.com/a/67289987/ provided by the user 'Matt Styles' ( https://stackoverflow.com/u/1208859/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Return a Value from Nested JavaScript Functions

When working with JavaScript, especially within the context of WebRTC, you may encounter the need to return values from nested functions. This is common when dealing with event handlers, such as onicecandidate. In this post, we’ll explore a specific problem scenario where you might struggle to return values, and we’ll provide a clear solution.

The Problem

You might find yourself writing a nested JavaScript function structured similarly to the following code:

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

In the code above, while console.log(addr) outputs the desired address, return addr; does not work as intended from within the .forEach loop. This can be frustrating, especially if you’re trying to capture a value for further use.

Understanding the Solution

Let’s break down how to effectively return a value from a nested JavaScript function by utilizing the correct method.

1. Using a Local Array

In cases where you need to gather multiple host addresses, you can create an array to store the addresses and return this array at the end of your function. Here’s how that looks:

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

2. Finding the First Valid Address

If you only need the first valid host address, you can optimize the process by using the .find method instead of .forEach. Here’s how you can implement that:

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

Conclusion

By adapting your approach to returning values in your nested functions, you can effectively harness the capabilities of JavaScript for handling events like onicecandidate. Whether collecting multiple addresses in an array or simply retrieving the first valid address, these techniques can streamline your code and improve functionality.

Next time you encounter a similar scenario in your JavaScript projects, keep these strategies in mind to facilitate returning values from your nested functions!

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