Скачать или смотреть How to Delete Object Keys and Return a Sorted Array from Object's Values in JavaScript

Learn how to efficiently `remove specific keys` from objects in an array and return a `sorted array` with their values using JavaScript.
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How to Delete Object Keys and Return a Sorted Array from Object's Values in JavaScript

When working with JavaScript, it's common to encounter scenarios where you need to manipulate data structures, especially objects and arrays. One frequent requirement is to delete certain keys from an object while transforming the object into a more usable format—like a flat sorted array of its values.

In this post, we will explore how to effectively remove specific object keys and then create a sorted array from the remaining object's values.

The Problem

Suppose you have the following array of objects:

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

You want to remove the __typename and id keys so that only the start and end keys remain. Afterwards, your goal is to create a new array that contains these values in a specific order:

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

With the given data, the expected outcome should look like this:

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

The Solution

To solve this problem, we can use JavaScript's array methods efficiently. The flatMap function serves as a powerful tool for transforming and flattening arrays simultaneously. Here’s how it works:

Step-by-Step Guide

Use flatMap to Iterate Over Each Object:
The flatMap method will take a callback function for each element in the array and return a new array that is a flattened version of the result.

Return the Desired Keys:
In this callback function, return an array containing the start and end values of each object.

Implementation:
Here’s the complete code to achieve the desired result:

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

Breakdown of the Code:

segments is the input array containing the original objects.

Within the flatMap, el represents each object.

parseInt converts the string representation of start and end into integer values, which is what you need.

Finally, the result variable now holds the desired output of [0, 316, 218, 534, 137, 202, 602, 738].

Conclusion

By following simple steps and utilizing JavaScript array methods like flatMap, you can easily manipulate object structures and achieve your data formatting goals. This approach not only simplifies the code but also improves readability and maintainability.

Experiment with your own data structures and see how you can apply these techniques to streamline your projects!