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Learn an efficient way to structure data in JavaScript by creating an array of objects while avoiding duplicate keys for object properties.
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How to Add Objects to an Array in JavaScript and Avoid Duplicate Keys for an Object

In web development, you often encounter scenarios where you need to store related data in a structured format. One common task is to create an array of objects based on two related arrays, ensuring that there are no duplicate keys when constructing the objects. Here’s how you can achieve that using JavaScript.

The Problem

Suppose you have the following two arrays:

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

At first glance, you want to combine these arrays to create an array of objects. Each object should represent a product and its corresponding price. The desired output would look like this:

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

However, your initial approach using a loop isn’t yielding the correct output due to how JavaScript handles object keys. Let’s discuss an effective solution to this issue.

The Solution

To overcome the issue of duplicate keys in JavaScript objects, you can use the map() function. This method creates a new array populated with the results of calling a provided function on every element in the calling array.

Step-by-Step Implementation

Use the map() function: It allows you to iterate over the productsForSale array and create a new object for each product, assigning the corresponding price from the soldPrice array to it.

Dynamic Object Keys: Use computed property names to ensure that each product name can be used as a key within the object. This approach allows for the creation of a new object for each product without overwriting previous entries.

Code Example

Here's how you can implement this:

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

Explanation of the Code

productsForSale.map(...): This function goes through each element (el) of the productsForSale array.

(el, i) => ({ [el]: soldPrice[i] }): This is an arrow function that takes the current product and its index, returning a new object. The computed property name syntax ([el]) allows for the creation of dynamic object keys.

console.log(output): Finally, this line prints the newly created array of objects to the console.

Conclusion

By using the map() function along with computed property names, you can efficiently create an array of objects in JavaScript while avoiding issues with duplicate keys. This method not only simplifies your code but also enhances its readability and functionality. Now you can confidently handle similar tasks in your JavaScript projects!

If you have any questions or need further assistance, feel free to ask in the comments below.