Скачать или смотреть How to Sort an Array of Objects in JavaScript

Learn how to easily sort an array of objects in JavaScript by using parent-child relationships and prioritizing elements based on their properties.
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How to Sort an Array of Objects in JavaScript: A Step-by-Step Guide

Sorting an array of objects based on hierarchical relationships can sometimes be a complex task in JavaScript. If you're struggling to manage parent-child relationships within an array, you're not alone! In this guide, we'll explore how to effectively sort an array of objects where some objects act as parents and others as their children.

The Problem

We have an array of objects that represent a hierarchy. Each object contains several properties, including id, parentId, title, and type. Our goal is to sort this array such that:

The topmost elements have a parentId of 0o0000.

Child elements are sorted below their respective parents.

If multiple child elements share the same parent, we want to prioritize child types over block types.

Here's the array we're working with:

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

This presents several challenges, especially when it comes to maintaining the correct order of elements while considering their hierarchical structures.

The Solution

To solve this problem, we can use a combination of groupings and recursive functions. Here’s a breakdown of the steps involved.

Step 1: Organizing the Data

First, we need to organize our data into a format that's easier to work with. We can achieve this using two objects:

A lookup for id - This will help us quickly access any object by its id.

A grouping by parentId - This will allow us to easily find all children of a given parent.

Step 2: Implementing the Recursive Function

We'll create a function called getItems that takes a parent as an argument. This function will:

Fetch all children of the specified parent from our grouping.

Sort these children, prioritizing block types above child types.

Call itself for each child to retrieve their children in turn.

Step 3: Writing the Code

Here's how we can implement this solution:

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

Explanation of the Code

Data Organization: We populate parents using reduce, grouping child IDs by their parentId.

Lookup Creation: ids is created using Object.fromEntries, which maps each object's id to its full object.

Sorting Logic: The getItems function sorts children based on the type, placing block types ahead of child types.

Recursive Fetching: The function calls itself recursively to gather all descendants of each child.

Conclusion

By following this structured approach, you can efficiently sort an array of objects in JavaScript while maintaining their hierarchical relationships. The solution prioritizes clear organization and the use of recursion to handle complex nested structures, making it robust and reusable for similar tasks in the future.

Happy coding! If you have further questions or need additional assistance with JavaScript arrays and sorting, feel free to reach out in the comments below.