How to Split an Array of Files into Chunks in JavaScript

Learn how to effectively split an array of files into manageable chunks based on file size limits using JavaScript and TypeScript.
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How to Split an Array of Files into Chunks in JavaScript

Handling file uploads efficiently is essential when dealing with large datasets in web applications. One common problem developers face is how to split an array of files into chunks based on their size, ensuring that no chunk exceeds a specified limit before sending it to a server. In this guide, we will explore how to achieve this using JavaScript, particularly with TypeScript types for added clarity.

Problem Breakdown

Imagine you have an array of files with various sizes, and you want to group these files into manageable chunks. For example:

A set of files: [10MB (Image A), 5MB (Image B), 5MB (Image C)] with a size limit of 20MB can be sent as a whole without any splitting.

However:

A set of files: [10MB (Image D), 10MB (Image E), 15MB (Image F)] would need to be split into two separate sends: one containing [10MB (Image D), 10MB (Image E)] and the other [15MB (Image F)].

Now, let's dive into the solution to implement this splitting mechanism, along with packaging them using FormData for sending to an endpoint.

Creating the Function

To achieve the desired outcome, we will create a function called sendChunks. This function will take an array of files, check their sizes, and create chunks that comply with the given size limit. Below are the steps taken to implement this:

1. Function Definition

We'll start by defining the function, its parameters, and its expected behavior.

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2. Important Points to Note

Type Safety: Make sure the NewImagesInterface includes a size: number property to represent the size of each file. This is critical for type safety considerations in TypeScript.

Error Handling: Ensure that uploads do not include individual files that exceed the limit.

Dynamic FormData Creation: FormData instances are dynamically created based on the chunk sizes, ensuring files are appropriately grouped.

Conclusion

By following this guide, you can efficiently split an array of files into chunks based on their size limits using JavaScript and TypeScript. The sendChunks function will help you create an array of FormData objects that can be easily sent to your server without the risk of exceeding size limitations. Embracing proper data structure management not only enhances performance but also improves the usability of your applications.

Thank you for reading! If you found this post helpful or have any questions, feel free to leave a comment below!