Скачать или смотреть How to Replace useState with an Interface in React TypeScript

Learn how to effectively use interfaces in React TypeScript to manage state more efficiently by replacing multiple useState calls with a single object state.
---
This video is based on the question https://stackoverflow.com/q/73572538/ asked by the user 'user15361826' ( https://stackoverflow.com/u/15361826/ ) and on the answer https://stackoverflow.com/a/73573012/ provided by the user 'Mike Shum' ( https://stackoverflow.com/u/16695994/ ) 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: Reactjs: How to replace the useState?

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.
---
Understanding the Challenge of Using useState in React TypeScript

When you're starting out with React and TypeScript, one common hurdle that new developers encounter is managing state effectively. Specifically, many beginners stick to using multiple useState calls for initializing and updating values. This can sometimes lead to complex code that is difficult to manage and maintain.

In a typical scenario, you might find yourself using several pieces of state, like setItem, setValue, and setError. While this is perfectly fine, there's a more organized approach: using a single state object with TypeScript interfaces to hold all the related values together. This not only makes the code cleaner but also enhances type safety and readability.

Let’s dive into how you can make this transition smoothly.

The Solution: Using an Interface to Manage State

Instead of using separate useState calls, you can represent your state as an object using an interface. Here’s a breakdown of how to do this:

Step 1: Define an Interface

Create an interface that describes the shape of your state. For instance:

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

This interface outlines that your state will consist of a string value for the email input, an array of strings for the emails, and optional properties for error messages and items to be edited.

Step 2: Initialize State Using useState

Now, instead of multiple useState calls, you can create a single state object. Here’s how you can declare your state at the beginning of your component:

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

Step 3: Update State Using a Single Function

When it comes to updating your state, instead of calling several setState functions, you can update the state with a single method. For example:

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

This function takes an object of type Partial<IDetails>, which means you can send only the fields you want to update, and it merges these changes with the existing state.

Step 4: Update State Based on User Interactions

Everywhere in your component where you previously had setItem, setValue, or setError, you can now call updateDetails instead. For example, when handling input changes:

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

Similarly, you can handle deletions or edits by calling:

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

Conclusion: Clean and Manageable Code

By consolidating your state management into a single object using TypeScript interfaces, you simplify your code and enhance its structure. This approach not only makes your components easier to read but also leverages TypeScript's powerful typing system to prevent errors.

Switching from multiple useState instances to a cohesive object state is a fantastic way to maintain robust and manageable React applications as they scale.

If you're ready to enhance your React TypeScript skills, consider implementing this state management technique in your next project!