Скачать или смотреть How to Combine Objects with Duplicate Values in a JavaScript Array

Learn how to efficiently combine objects with duplicate properties in JavaScript arrays, and simplify your data manipulation process.
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How to Combine Objects with Duplicate Values in a JavaScript Array

When working with data in JavaScript, especially in the form of arrays of objects, you might often encounter a situation where multiple objects share the same property value. For instance, consider an array containing multiple instances of objects, some of which have the same name or property. How can we effectively merge these objects into a single entry that consolidates their data?

In this guide, we'll address this common issue by breaking down the steps needed to combine these duplicate objects, using an illustrative example.

The Problem

Imagine you have an array of objects like this one:

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In this array, the objects with the name "highway" are problematic because they represent the same category of data but are duplicated. Your goal is to create a single object with the name "highway" that combines the data from both entries.

The Solution

Step 1: Initialize an Object to Accumulate Data

You will begin by creating an empty object to hold your combined data. This will allow you to map property names to their corresponding values:

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Step 2: Loop Over the Original Array

Using the forEach method, iterate over each object in the data array. During each iteration, check if the name already exists in the myData object:

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Step 3: Merge the Data

If the name already exists in myData, you need to "unwrap" the array when pushing the new data. Use the spread operator (...) to achieve this:

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If the name is new, simply add the data to the myData object:

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Step 4: Consolidate the Results

Once all data has been processed, convert myData into an array format. This involves creating a new result array and pushing combined objects for each name:

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Step 5: Review Your Result

Finally, log the result to see the consolidated data:

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Example Code

Putting all these steps together, here’s the complete code:

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Conclusion

By following the steps outlined in this guide, you can efficiently combine objects with duplicate values in JavaScript arrays. This method not only helps clean your data but also makes it easier to manage and analyze. Remember, using the spread operator and properly organizing your data structure can save you a great deal of time and headaches in the future!