Скачать или смотреть How to Efficiently Set an Atom's Value to true in Clojure

Discover the simplest way to set an atom's value to `true` in Clojure instead of using complex workarounds.
---
This video is based on the question https://stackoverflow.com/q/63069216/ asked by the user 'jac08h' ( https://stackoverflow.com/u/12580224/ ) and on the answer https://stackoverflow.com/a/63069808/ provided by the user 'leetwinski' ( https://stackoverflow.com/u/5400548/ ) 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: Clojure: set atom's value to true

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.
---
How to Efficiently Set an Atom's Value to true in Clojure

In Clojure, atoms are a powerful way to manage shared, mutable state. One common task that developers encounter is changing the value of an atom. Specifically, if you have an atom that holds a boolean value, you might find yourself needing to set it to true. While various workarounds exist for this task, there is a more direct approach that is both simpler and more efficient.

The Problem: Changing an Atom's Value to true

In the provided example, the user is trying to change an atom that initially holds a false value to true using a custom function:

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

While this code technically works, it's unnecessarily complex for the straightforward task of updating an atom's value. The user is seeking a more efficient solution to set the value of the atom to true.

The Solution: Using reset! Function

Clojure provides a built-in function called reset! that is perfectly suited for this exact use case. The reset! function is used to update the value of an atom directly and can make your code cleaner and more understandable.

Here’s how to do it:

To change the value of an atom x that holds a boolean, you would simply use the following code:

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

This line of code will reset the atom x directly to true, fulfilling your requirement in a straightforward manner.

Key Benefits of Using reset!

Simplicity: No need for additional functions or complexity.

Clarity: It makes your intent clear, as reset! is designed specifically for changing the value of atoms.

Efficiency: The built-in method avoids unnecessary overhead from custom functions.

Conclusion

In summary, if you’re looking to change an atom's value in Clojure, especially for something as simple as toggling a boolean, utilize the reset! function instead of creating custom functions. This approach leads to cleaner, more maintainable, and more efficient code. By employing the right tools for the job, you're making your development process smoother and more productive.

Now that you know how to efficiently change an atom's value to true using reset!, you're better equipped to handle mutable states in your Clojure applications.