Скачать или смотреть Rendering Typescript React Lists with Props

Learn how to effectively render lists in TypeScript React by passing props correctly. This guide covers the essential steps and common pitfalls for beginners.
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This video is based on the question https://stackoverflow.com/q/63363423/ asked by the user 'GabVlado' ( https://stackoverflow.com/u/14088448/ ) and on the answer https://stackoverflow.com/a/63364066/ provided by the user 'Alex Wayne' ( https://stackoverflow.com/u/62076/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding and Rendering Lists in TypeScript React

When you're new to using TypeScript with React, you might face challenges, especially when it comes to passing props from one component to another. If you're trying to render a list of technologies and getting errors or nothing displays on the screen, this guide will help you understand why that happens and how to fix it.

The Problem

Imagine you have a list of technologies you want to display using React components. Your code looks almost complete, but the list doesn’t render as expected. This problem typically arises from mismatched props between your parent and child components.

For example, the code you've provided seems like this:

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

The Cause of the Issue

Your child component, Technology, is set up to receive props in a specific format. Currently, the Technology component expects id and name as separate props, while you are passing an entire object.

This is how your Technology.tsx looks:

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

Since you're passing an object (technology) instead of individual properties, React cannot find the expected props.

The Solution

To solve this problem, you can change how the props are accepted in the Technology component. Here are two effective approaches:

Approach 1: Explicitly Pass id and name

Modify the Technology component to accept individual props like this:

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

Then, update your App.tsx to pass id and name separately:

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

Approach 2: Change the Component Props to Accept an Object

Alternatively, you can modify the Technology component to accept a single technology prop that is an object. Here's how you can implement this:

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

With this adjustment, your App.tsx will stay the same:

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

Conclusion

With these adjustments, your list of technologies should render perfectly within your React application. Remember that understanding how to properly pass props and structure your components is crucial when working with TypeScript in React. By following the methods outlined above, you can avoid common pitfalls and effectively manage state and props in your applications.

Now it's time to put this knowledge into practice and render your lists without any issues! Happy coding!