How to Assign Values Between Arrays of Objects in JavaScript Without Referencing `

Learn how to effectively assign values from one array of objects to another in JavaScript without unintended references. This guide includes code examples and deep cloning techniques!
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Understanding Array References in JavaScript

When you're working with arrays of objects in JavaScript, you may encounter a common issue: unintended references. This problem can lead to changes in one array unexpectedly affecting another. In this post, we will address how to assign values between two arrays of objects without creating these problematic references.

The Problem

Imagine you have two arrays, A and B:

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

You then modify B in your code, perhaps to update some data points:

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

However, you notice that updating array B also updates array A. Why does this happen? It's because B is actually a reference to the same objects that A holds. Both arrays are pointing to the same memory locations for their objects.

The Solution: Cloning the Objects

To truly separate the two arrays so that they do not reference each other's objects, you need to deep clone the objects within the array. Here are the methods:

Method 1: Shallow Cloning with Object Assignment

If your objects don’t contain nested objects, you can use the following technique:

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

Method 2: Deep Cloning Function

If your objects do have nested objects, you will want to implement a deep clone function. Here’s a simple example:

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

Explanation of the Deep Clone Function

Base Case: If the item is an array, create a new array, otherwise create a new object.

Recursion: If the current property is an object, call cloneObj recursively. This ensures that all nested objects are also cloned.

Data Copying: For primitive properties, simply assign their values.

Conclusion

By understanding how JavaScript handles references, you can manage your arrays of objects effectively. Use shallow cloning for simple objects and implement a deep cloning function for more complex structures to avoid unintended updates.

Now you should be well-equipped to work with arrays of objects in JavaScript without running into reference issues. Happy coding!