Скачать или смотреть How to Reorder an Array in JavaScript Without Using an Index

Discover how to effectively reorder a JavaScript array into a structured format by leveraging object keys, even when you don't know values in advance.
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This video is based on the question https://stackoverflow.com/q/71650458/ asked by the user 'mouchin777' ( https://stackoverflow.com/u/9010895/ ) and on the answer https://stackoverflow.com/a/71650604/ provided by the user 'Andrea Olivato' ( https://stackoverflow.com/u/1529324/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Reorder an Array in JavaScript Without Using an Index

Reordering an array can be a challenging task, especially when you want to group items based on specific properties without using indices. Suppose you have an array of objects, each containing code, country, and price, and your goal is to rearrange this array into a new structure where prices are grouped by their codes.

In this guide, we’ll walk through the steps required to achieve this and present you with a working JavaScript snippet for better understanding.

Understanding the Problem

You have the following array:

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

You want to transform it into a new structure that looks like this:

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

Steps to Solve the Problem

Step 1: Fix the Original Array Declaration

Before diving into the logic, ensure your initial array is structured correctly. For instance, each country should be wrapped in quotes, as shown below:

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

Step 2: Loop Through the Original Array

To rearrange the array, you will need to loop through each element and build an object that groups the necessary items by their codes. Here's how we can do it:

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

Step 3: Adding the Code Reference

To get your final output matching the example you provided, you may need to append the code value into the price strings. You can do this by modifying the assignment within the loop:

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

Step 4: Convert the Final Object to an Array

If you prefer the final output as an array rather than an object, loop through the built object to push its values into a new array:

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

Conclusion

By following these steps, you can easily reorder your JavaScript array based on the codes, effectively creating a new structure that groups prices according to country codes. This approach keeps your code clean and ready for further operations, such as data visualization or API integration.

Feel free to use the provided code snippets to recreate this functionality in your projects, and happy coding!