How to effectively manage Web Workers to perform heavy computations without blocking the main thread?

The main problem of web applications is that JavaScript runs on a single thread. This means that complex mathematical calculations, processing large arrays of data, or parsing heavy files completely freeze the interface, making it unresponsive to user actions.

To solve this problem, web workers are used, which allow running scripts in background threads independently of the main interface thread. The background worker performs all heavy tasks in isolation, and then passes the finished result back to the main thread via a messaging mechanism.

To properly implement this solution in your project, follow a specific sequence of actions.

It is important to remember that background workers do not have direct access to the document object and the DOM model. They are created exclusively for pure computations, data processing, working with network requests via fetch, or indexed databases.

Proper task distribution between threads allows creating responsive interfaces that continue to scroll smoothly and respond to clicks even during the execution of complex background algorithms.