Скачать или смотреть How to group ID's for Duplicate Objects and Remove Objects in an Array Using JavaScript

Discover how to efficiently `group duplicate object IDs` and remove duplicates in a JavaScript array. Learn step-by-step techniques to achieve your expected results.
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How to Group ID's for Duplicate Objects and Remove Objects in an Array Using JavaScript

When working with arrays in JavaScript, you might encounter situations where you need to manage duplicate objects based on specific properties, such as an ID or a title. Specifically, this guide aims to solve the problem of grouping duplicate objects by their title and then removing the duplicates while preserving the necessary information.

The Problem

Consider the following array of objects:

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From this array, our goal is to group the objects based on their title, and when multiple objects share the same title, we want to merge their IDs into an array. The expected output should look like this:

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

The Solution

To achieve this grouping and deduplication of objects, we can utilize JavaScript's forEach method along with the find method. Below, I'll break down the solution step-by-step.

Step 1: Initialize Variables

Start by defining the initial array of objects and an empty array named dest, which will hold our grouped results.

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Step 2: Iterate Over Each Object

Using the forEach method, we can loop through each object in the items array:

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Step 3: Find Existing Titles

Within the loop, we check if there is an existing object in dest with the same title as the current object:

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Step 4: Handle Duplicates

If an object with the same title is found:

Check if find.id is already an array. If it is, append the current object's ID to this array. If not, create a new array with both IDs.

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Step 5: Output the Result

Finally, log the results to the console:

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Complete Code

Here’s the complete solution, combining all the steps we discussed:

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

Conclusion

By following the steps outlined above, you can effectively group duplicate objects by their title and remove duplicates in a JavaScript array. This approach is not only efficient but also leverages modern JavaScript features to simplify your code.

Feel free to use this method as a foundation for any similar tasks you encounter in your coding journey!