Efficiently Skip in ngFor With Angular: An Improved Approach

Discover a more efficient way to handle category display in Angular using `ngFor`. Simplify your code with our easy-to-follow solution!
---
This video is based on the question https://stackoverflow.com/q/67272345/ asked by the user 'MarkMark' ( https://stackoverflow.com/u/15368857/ ) and on the answer https://stackoverflow.com/a/67272477/ provided by the user 'Kinglish' ( https://stackoverflow.com/u/1772933/ ) 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 to skip in ngFor if was true, or other ways (Angular)

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Efficiently Skip in ngFor With Angular: An Improved Approach

When building complex applications with Angular, you may encounter scenarios where you need to display unique items from an array only once, based on certain conditions. This is especially pertinent if your array is made up of objects that belong to various categories. In this guide, we will tackle a common challenge faced by developers: how to efficiently display category names and their icons without redundancy using Angular's structural directive, ngFor.

The Problem

When dealing with an input array that contains objects of different categories (for instance: car_def, car_fyr, and car_spy), you might want to display the category names only once, even if they appear multiple times in the array. Also, next to each category, a relevant icon should be displayed based on the category name.

Here’s an example of the input array structure we are working with:

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

Based on this array, our goal is to display something like:

CAR_DEF with its icon

CAR_FYR with its icon

However, the way we tried to achieve it was using individual *ngIf statements, which resulted in a lot of repetitive code.

The Solution

To simplify our approach and make our code more maintainable, we can modify our implementation using a more streamlined method. Below, I will break down the solution into clear sections.

Step 1: Refactoring the Component Logic

Instead of tracking multiple boolean variables (isDef, isFyr, isSpy), we can use a single object to store our category name and icon:

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

Step 2: Updating the HTML Template

Now that we have streamlined our logic, we can simplify our HTML template significantly. Instead of using multiple *ngIf statements, we can check typeData once and render its contents accordingly.

Here’s how the HTML will look:

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

Conclusion

With this refined approach, not only does your code become cleaner and easier to read, but it also minimizes the amount of repetitive statements and logic you need to manage. By consolidating our category display logic, we ensure that the application remains responsive and easy to maintain as more categories are introduced in the future.

By using techniques like checking for any category presence with some() and leveraging Angular's reactive capabilities, you create scalable and effective solutions. I hope this approach makes your development with Angular smoother and helps you create more efficient user interfaces!

Видео Efficiently Skip in ngFor With Angular: An Improved Approach канала vlogize