How to Dynamically Create a List of Different Objects in JavaScript

Discover how to dynamically create an array of different objects in JavaScript without modifying the existing ones. Learn simple and effective coding techniques.
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Dynamically Creating a List of Different Objects in JavaScript

If you're working with JavaScript and need to create a dynamic list of objects, you might run into a common issue: modifying the same object every time you create a new one. This can lead to unexpected results, especially when all elements in your array reflect changes in the same object instance. In this post, we'll explore how to create a list of different objects dynamically and avoid this problem.

The Problem: Shared References in JavaScript Objects

Imagine you have a function that creates an object and adds it to an array each time it is called. If you're not careful, you might end up with all elements in your array pointing to the same object. This happens because objects in JavaScript are reference types—when you assign an object to a variable or an array, you're actually assigning a reference to that object.

Here's a look at the problem in your code:

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

In this scenario, every time you call the send() function, you're modifying the same results object, which means all entries in finalResults will share the last state of results when the function ended.

The Solution: Create a New Object Each Time

To avoid this issue, you need to create a new instance of the object each time the function is called. Here's how you can modify the send() function to ensure that you add a new object each time:

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

Step-by-Step Breakdown

Object Creation Inside the Function: By defining the object within the send() function, you ensure that each call creates a new instance rather than modifying a shared instance.

Using an Object Literal: This method uses object literal notation ({}) to create a new object with the current values.

Incrementing the Counter: After storing the newly created object in finalResults, increment the counter to prepare for the next entry.

Benefits of This Approach

No Shared References: Each object in your array points to a unique instance.

Dynamic Growth: You can keep adding objects to your array without them affecting each other.

Readability: The code becomes cleaner and easier to understand by isolating the object creation.

Conclusion

With this understanding, you can now dynamically create an array of different objects in JavaScript effectively. By ensuring each object is created in its own scope, you avoid common pitfalls related to shared references. Follow these best practices, and you'll be able to manage your data structures with confidence!

If you have any questions or further clarifications, feel free to leave a comment below. Happy coding!