Скачать или смотреть How to Filter Specific Values from JSON Arrays in Angular/TypeScript

Discover how to easily exclude specific words from JSON arrays using `Angular` and `TypeScript` in this informative guide.
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This video is based on the question https://stackoverflow.com/q/70878075/ asked by the user 'Nano' ( https://stackoverflow.com/u/17016346/ ) and on the answer https://stackoverflow.com/a/70878324/ provided by the user 'Hakime Sheikhalishahi' ( https://stackoverflow.com/u/14886953/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Filtering JSON Data in Angular/TypeScript

When working with JSON data in Angular or TypeScript, there may come a time when you need to manipulate or filter that data. One common scenario arises when you want to display certain values while excluding others. In this post, we’ll address a specific question: How can you display hobbies without the word “all” in Angular/TypeScript?

Understanding the Problem

Let’s review the JSON structure we are working with. Here’s an example containing user details, along with their hobbies:

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

In this JSON object, we have a list of hobbies, but sometimes the value "all" appears, which we want to remove from our display. To make our data presentation cleaner and more relevant to users, we need to filter this list effectively.

The Solution

To address this issue, we can utilize JavaScript's filter() method in conjunction with the map() function. Here’s how to do it step by step:

Step 1: Mapping Through the Data

We need to iterate through each element in our data set. This is where the map() function comes in handy. It allows us to create a new array by applying a function to each element of the original array.

Step 2: Filtering Out Specific Values

While mapping, we can apply the filter() method on the Hobbys property of each element. This method will help us create a new array that excludes the undesirable value, in this case, "all".

Step 3: Putting It All Together

The complete solution in TypeScript will look like this:

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

Code Explanation:

data.map(...): This iterates over each object in the data array.

val.Hobbys.filter(...): For each user object, it filters out the value "all" from the Hobbys array.

x !== 'all': This condition checks each hobby and includes it in the new array only if it is not "all".

Finally, we return the modified object to reflect the change.

Final Thoughts

By implementing the code above, you can efficiently filter out unwanted values from arrays in your JSON data before displaying them in your Angular or TypeScript application. This not only enhances data cleanliness but also improves user experience by providing them with relevant information.

With this understanding, you can now handle similar tasks in your projects, ensuring your data remains precise and user-friendly. Happy coding!