Скачать или смотреть How to Sort JSON Arrays in Angular 6 by Nested Key Values

Learn how to sort JSON arrays in Angular 6 by using a custom comparer function based on nested object keys.
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How to Sort JSON Arrays in Angular 6 by Nested Key Values

Sorting data efficiently is a common requirement when developing applications. In this guide, we'll specifically address a problem that many developers face: how to sort a JSON array based on a key found within a nested object. Let's dive right into the details to understand how you can achieve this in Angular 6.

The Problem: Sorting a JSON Array

Suppose you have an array of data objects that each contain a name and a nested object called 'list', which has an 'order' property. Here's a simple illustration of the data structure:

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The challenge here is to sort this array based on the 'order' property found within the 'list' object. You may wish to sort in either ascending or descending order, depending on your application's requirements.

The Solution: Using Array.sort with a Custom Comparer Function

To sort this data, you can utilize the built-in Array.sort() method provided by JavaScript combined with a custom comparer function. Below, we'll break down how to implement this solution.

Step 1: Define Your Data

First, let’s start by defining your data structure. This is crucial as it serves as the basis for your sorting logic.

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Step 2: Sort in Ascending Order

To arrange your JSON array in ascending order (from the smallest to largest 'order'), use the following comparator function in sort():

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This function works by comparing the 'order' values of each object (a and b). If the result is less than 0, a will be placed before b, effectively sorting the array.

Step 3: Sort in Descending Order

If you need to sort the data in descending order (from largest to smallest 'order'), you can modify the logic slightly:

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

In this case, the comparison is reversed, placing the higher 'order' values at the beginning of the array.

Conclusion

Sorting nested JSON arrays in Angular 6 is a straightforward task when you utilize the Array.sort() method combined with a custom comparer function. By understanding how to manipulate your data structure and apply sorting techniques, you can effectively manage and display your data based on any nested key values.

Key Takeaways

Understand your data structure to determine how sorting will be applied.

Use Array.sort() with a custom comparator to sort by nested key values.

Choose the comparison direction (ascending or descending) based on application needs.

With these steps, you can sort your JSON arrays effortlessly and enhance the presentation of data in your Angular applications.