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Скачать или смотреть Using the trackBy Function in Angular 14 with Strict Mode

  • vlogize
  • 2025-04-03
  • 2
Using the trackBy Function in Angular 14 with Strict Mode
How using Angular 14 trackBy Function with strict-mode: true?angulartypescript
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Описание к видео Using the trackBy Function in Angular 14 with Strict Mode

Discover how to properly implement the `trackBy` function in Angular 14 while using strict mode. Learn the steps to resolve type conflicts and improve your project's efficiency.
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This video is based on the question https://stackoverflow.com/q/73316245/ asked by the user 'HOST-X' ( https://stackoverflow.com/u/18846474/ ) and on the answer https://stackoverflow.com/a/73316727/ provided by the user 'Pankaj Parkar' ( https://stackoverflow.com/u/2435473/ ) 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: How using Angular 14 trackBy Function with strict-mode: 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.
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How to Use the trackBy Function in Angular 14 with Strict Mode

Angular 14 brought significant improvements to the framework, particularly when it comes to type safety and performance. However, leveraging these new features can sometimes create challenges, especially if you're unsure how to properly implement them. One common issue developers face is using the trackBy function effectively while strict-mode is enabled.

In this guide, we will dive into the specific problem of integrating the trackBy function in Angular 14 with strict-mode: true and provide a detailed explanation of how to solve it.

Understanding the Problem

When developing Angular applications, especially with strict-mode enabled, you may encounter type errors that prevent your code from compiling or running correctly. In our case, we want to utilize the trackBy function within an *ngFor directive to optimize rendering of a list of items.

The Existing Code

Here’s the original code that works perfectly fine when strict-mode is set to false:

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

And the corresponding TypeScript code:

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

The Issue with Strict Mode

Upon enabling strict-mode, when you change the trackByFn to:

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

You will face the error:

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

This is because the code is not aligned with the expected TrackByFunction interface structure.

How to Solve the Issue

To resolve the issue, we need to modify the trackByFn method so that it adheres to the TrackByFunction interface. This will allow us to utilize the full capabilities of Angular's strict mode without errors.

Step-by-Step Solution

Understanding TrackByFunction:
The interface for TrackByFunction is defined as:

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

Update trackByFn Method:
We need to redefine the trackByFn method to comply with the specified signature:

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

Complete Updated Code

Here is the updated app.component.ts with the corrected trackByFn:

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

Conclusion

By modifying the trackByFn method to correctly align with the TrackByFunction interface signature, you can successfully use the trackBy function in Angular 14 with strict-mode: true. This adjustment not only resolves type conflicts but also enhances the performance of your application by optimizing the rendering of your lists.

If you're facing similar issues or need further clarifications, feel free to drop a comment below!

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