Скачать или смотреть How to replace objects in an array with different objects in JavaScript

Learn how to efficiently replace object references in arrays in JavaScript, making your data structures easier to manage and more dynamic.
---
This video is based on the question https://stackoverflow.com/q/64019664/ asked by the user 'poldeeek' ( https://stackoverflow.com/u/11973926/ ) and on the answer https://stackoverflow.com/a/64019830/ provided by the user 'Derek Menénedez' ( https://stackoverflow.com/u/14321954/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: replace object in array with different object

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction

If you’ve ever worked with JavaScript arrays, you know how crucial it is to manipulate data efficiently. One common challenge developers face is replacing references to objects within a nested structure. In this guide, we will look at a scenario where you need to replace invited_user_id in a results array with the corresponding user object from a users array. This is a common use case when handling data in applications where user interactions are tracked, such as invitations or notifications.

The Problem

Imagine you have the following two arrays representing data for a user invitation system:

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

In the results array, the invited_user_id is simply a string that references an ID from the users array. What you want is not just the ID but the entire user object, like this:

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

You want to replace the invited_user_id value with the full user object that matches the ID.

The Solution

To perform this replacement, you will loop through the results and users arrays and replace the invited_user_id with the user object that corresponds to it. Here’s how you can do it effectively in JavaScript.

Step-by-Step Implementation

Prepare Your Data: Start with your JSON data structured in two separate arrays: results and users. You will use these to create the final data structure.

Loop Through Results: For each result, you will check against each user to see if the invited_user_id matches any of the user _ids.

Replace the ID with Object: If there's a match, replace the invited_user_id with the user object. After processing all results, you will have your desired output.

Sample Code

Here’s a simple code snippet to achieve this:

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

Explanation of the Code

Data Structure: You first define your JSON structure where both arrays exist.

Nested Loops: Using forEach, you loop through each result and then loop through each user to find matches.

Condition Check: The condition checks if the invited_user_id matches the user ID.

Updating Data: If a match is found, the invited_user_id in the current result object is replaced with the full user object.

Final Output: Finally, the modified results are logged or returned in a new data structure.

Conclusion

This approach lets you efficiently replace object IDs in an array with the full object from another array. This technique is especially useful in applications where having rich user data is necessary for functionality. By following the steps outlined, you are now capable of transforming data structures to meet your application's needs more dynamically.

By mastering these techniques, you'll find yourself better equipped to handle complex data manipulations in JavaScript. Happy coding!