How to Properly Return Multiple Values from a Function in JavaScript

Learn how to set multiple variables to the returned values of a function in JavaScript using arrays and destructuring.
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Introduction

Working with functions in JavaScript can sometimes lead to confusion, especially when it comes to returning multiple values. A common issue developers encounter is needing to return several variables from a function, only to find that JavaScript only allows a single return value. This can lead to errors, such as variables being undefined when trying to destructure them. In this guide, we will explore how to successfully return multiple values from a function in JavaScript, providing clarity and practical examples to enhance your coding skills.

The Problem

Suppose you have a function that returns names and a specific name that you want to find. Initially, you might try to perform this in the following way:

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The issue arises because the return statement in JavaScript can only return one value. When trying to return names and nameFind this way, the second value is ignored, leading to confusion and undefined variables.

The Solution

Returning an Array

To properly return multiple values, the simplest approach is to return an array containing the values you want. Here’s how you can modify the data function to achieve this:

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Extracting Values from the Array

Once you've returned the values as an array, you can extract them in the calling code. Here’s how you can do it:

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This approach is effective and allows you to work with both returned values seamlessly.

Using Destructuring Assignment

For those using modern JavaScript (ES6 and beyond), you have the option of using destructuring assignment. This allows you to unpack the values directly. Here's how to apply destructuring:

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Conclusion

JavaScript functions can be tricky when it comes to returning multiple values, but using arrays or destructuring can help you navigate this challenge. By returning values in an array and then using either indexing or destructuring, you can effectively manage multiple outputs from a function.

Now you can take full advantage of JavaScript's capabilities and avoid the common pitfalls of undefined variables in your code. Happy coding!