Скачать или смотреть Converting keyValue Pairs to Arrays in Angular with TypeScript

Learn how to transform `keyValue` pairs into structured arrays in Angular TypeScript to streamline your data handling and enhance app functionality.
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How to Turn Key-Value Format to an Array in Angular TypeScript

In many Angular applications, you might encounter data in a keyValue format, especially when dealing with JSON objects. For instance, consider the following object structure representing countries and their respective values:

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To effectively manage this data, you may want to convert it into a more structured array format that can enhance readability and usability. Our goal here is to transform the above JSON structure into an array of objects like this:

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

This structured conversion can be very beneficial when you need to iterate over the array for rendering in templates or passing to components. Let's dive into how we can achieve this in TypeScript.

Solution: Converting Objects to Arrays

The conversion from an object to an array in TypeScript can be straightforward with the help of built-in methods. Here’s how you can do it:

Step 1: Understanding Object.keys() and Array.prototype.map()

Object.keys(): This method returns an array of a given object's own enumerable property names (keys).

Array.prototype.map(): This method creates a new array populated with the results of calling a provided function on every element in the calling array.

By utilizing these two methods together, we can effectively format our data.

Step 2: Implementing the Conversion

Here’s the complete code to perform the conversion:

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Explanation of the Code

Initialization: We start by defining our countryNew object with country codes and their respective values.

Key Extraction: Object.keys(countryNew) retrieves the keys of the object, which in our case are country codes.

Mapping to Objects: We then use .map() to create an array where each element is an object containing countryCode and value. The key represents the countryCode, while countryNew[key] fetches the corresponding value.

Output

When you run the above code, the output will be structured as follows:

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Conclusion

Converting a keyValue pair object into an array of objects in Angular using TypeScript is an efficient way to handle data. By leveraging Object.keys() and Array.prototype.map(), we can turn complex data into a more manageable format. This conversion not only streamlines data access but also enhances the overall usability of your application.

Feel free to implement this technique in your Angular projects to improve data handling!