Скачать или смотреть How to Return an Anonymous Type Instead of a Boolean in JavaScript Function

Learn how to properly return an anonymous type in your JavaScript function instead of a Boolean. This guide will help you fix issues related to accessing properties of your returned object.
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This video is based on the question https://stackoverflow.com/q/64459562/ asked by the user 'novafluff' ( https://stackoverflow.com/u/7611620/ ) and on the answer https://stackoverflow.com/a/64459734/ provided by the user 'Sefe' ( https://stackoverflow.com/u/2365900/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Returning a Boolean Instead of an Object

In JavaScript, when working with functions, we may sometimes get unexpected return types. This guide addresses a common issue where a function is intended to return an object containing configuration messages, but instead, it returns a boolean.

The root of the problem can be traced back to the use of the Array.prototype.every method, which checks if all elements in the array satisfy the specified condition. The function in question is data validation, and it’s essential to understand how to return detailed information about the validation results instead of a simple boolean value.

The Situation Explained

Consider the following function designed to check configuration settings:

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

The expectation is that calling this function would allow you to check if the settings are valid and access the corresponding message. This is not happening, as it always returns a boolean value instead of an object.

Why Is It Returning a Boolean?

The return type of a function passed to every is evaluated for its truthiness. Since your function returns an object ({ isValid: false, message: "..."} or { isValid: true, message: ""}), every interprets this as true, so regardless of the settings, the overall result is always true.

Key Points:

The every method only returns true if all checks are truthy.

Returning an object doesn't satisfy the expected return type for the every method.

Solution: Returning the Correct Object Type

To achieve your desired outcome, you can restructure your validation function to correctly accumulate the result and return it.

Revised Code

Here’s a proposed solution to adjust your function logic:

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

Explanation of Changes:

Accumulating Results: Instead of immediately returning an object within the loop, we’re modifying a result object that holds the validity and message.

Return Control: return false halts further iteration when invalid settings are detected.

Final Return: The result object is returned, allowing you to check both isValid and message afterwards.

Conclusion

By modifying how results are accumulated and returned in your function, you can effectively manage validation checks and provide meaningful feedback about configuration settings. Following this best practice not only helps in writing clearer code but also enhances the maintainability of your scripts in a complex environment like a cshtml file.

Now, when you call your function and check the configuration settings, you will be able to access both the validation state and messages effectively:

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

Implementing these adjustments will lead to increased clarity and functionality within your application. Happy coding!