How to Update an Array of Objects with Corresponding Values from Another Array

Learn how to effectively `update an array of objects` in JavaScript by adding new properties from another array, ensuring a smooth data merge.
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How to Update an Array of Objects with Corresponding Values from Another Array

Working with arrays is a common requirement in JavaScript development, especially when dealing with objects. One common task developers encounter is the need to merge data from two arrays, particularly when one array needs to be updated with values from another corresponding array. This guide will guide you through how you can achieve this, ensuring your arrays maintain a seamless relationship in your code.

Understanding the Problem

Consider the following example where you have an array of objects called data that looks something like this:

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

Now, you also have another array named myNumberArray that looks like this:

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

Your goal is to enrich each object in the data array by adding a new attribute called number, where the value comes from the corresponding index of myNumberArray. After the update, your data should look as follows:

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

The Solution

To achieve this, we will employ the forEach method, which is perfect for iterating over an array. It allows you to access both the current element and its index, which we will use to get the corresponding value from myNumberArray.

Step-by-Step Breakdown

Use forEach to Iterate:
The forEach method will loop through the data array, allowing you to modify its elements.

Access & Modify Elements:
During each iteration, we will access the current index to retrieve the value from myNumberArray and assign it to a new number property of the current object in the data array.

Here is how the code looks:

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

Explanation of the Code

Parameters of forEach: The forEach method takes a callback function that receives two arguments: the current element (elem) and its index (index).

Updating the Object: Inside the function, we set a new property number on the current element of data, assigning it the value from myNumberArray at the same index.

Conclusion

By following the steps outlined above, you can easily update an array of objects in JavaScript with data from another array, maintaining a clear and organized code structure. This approach is particularly effective for one-to-one mappings, as seen in the example, and can be applied to larger data sets as well.

Now, you have a solid understanding of how to enrich your arrays, making your data handling more efficient and streamlined in your JavaScript applications!