Is Using a Single Object in useState a Bad Practice in React? Solution to Disable Button

A common question among React developers: Is it bad practice to use a single object for managing multiple states with `useState`? Here, we explore the solution for proper button disabling in your component!
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This video is based on the question https://stackoverflow.com/q/71898579/ asked by the user 'Tobi' ( https://stackoverflow.com/u/16585194/ ) and on the answer https://stackoverflow.com/a/71902638/ provided by the user 'Tobi' ( https://stackoverflow.com/u/16585194/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding useState with Objects in React

As React developers, we often face the challenge of managing component states effectively. One question that frequently arises is whether it's a good practice to create a useState hook with a single object containing all the states we want to manage. While some developers might prefer handling individual states separately for clarity, using a single object can be efficient and manageable when done correctly.

The Problem: Button Disabling Logic

In the provided code snippet, we have a component that uses a single object items in useState to manage various states, including contents and purchasable. The main issue presented revolves around the button disabling logic, specifically:

The button should be disabled when the total sum of items in contents equals zero.

However, despite adding items to the cart, the button remains disabled, which leads to confusion and inconsistency.

Code Snippet for Reference

Here's the relevant part of the original code:

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

Solution: Correcting the Button Logic

After examining the code and the problem, the solution involves correcting how we determine the purchasable state based on the contentsSum value. This can be achieved with the following steps:

1. Using useEffect for State Updates

By employing useEffect, we can ensure that the disableButton function reacts appropriately whenever items are added or removed.

2. Adjusting the Condition for Disabling

Instead of checking if contentSum is greater than zero, we need to ensure that the button is enabled when items exist. Thus, we can invert the condition:

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

3. Ensure Content Count is Not Negative

While adding and removing items, we might have a scenario where removing items could lead to an attempt to set a negative count. We want to ensure our logic protects from that.

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

Sample Updated Code

Here’s a concise version of the updated function demonstrating the changes:

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

Conclusion

Using a single object with useState to manage multiple states in React is not inherently a bad practice. However, developers need to ensure that their logic is sound, especially when determining how states interrelate, such as enabling or disabling UI elements like buttons.

By following the steps outlined above, you can improve the behavior of your button and manage your state effectively in a React component. Always remember to test your code after making changes to feel confident about its correctness. Happy coding!

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