JavaScript has changed a lot since 2015, especially thanks to improvements in the ECMAScript specification. Early JavaScript was difficult to work with due to issues like function-scoped variables and callback hell. Modern JavaScript has introduced features like block-scoped variables, arrow functions, promises, and async/await, which makes development much better. Tooling has also gotten better.

Function composition allows combining multiple functions into one. JavaScript can be tricky with functions that take multiple arguments. This article explores solutions like partial application and currying to achieve function composition in various scenarios.

Maska is a lightweight JavaScript library that allows you to create input masks without any external dependencies.

This article explains the difference between concurrency and parallelism, how they are implemented in JavaScript, and the potential pitfalls of using them in Node.js.

AbortController is a powerful yet often overlooked feature in JavaScript that allows developers to manage and abort ongoing operations, such as network requests and event listeners. This global class provides a straightforward way to handle cancellation, enhancing the control developers have over their applications. When you create an instance of AbortController, you receive two key components: the `signal` property, which is an instance of AbortSignal, and the `.abort()` method. The signal can be passed to various APIs, enabling them to respond to an abort event. For instance, if you attach the signal to a fetch request, calling `controller.abort()` will terminate that request. The actual logic for handling the abort event is defined by the consumer, allowing for flexibility in how different parts of an application respond to cancellation. By adding an event listener to the signal, developers can implement custom abort logic tailored to their specific needs. AbortController is particularly useful with event listeners. By providing a signal when adding an event listener, the listener can be automatically removed when the abort event is triggered. This eliminates the need for additional code to manage listener removal, streamlining the process significantly. Moreover, a single signal can be used to manage multiple event listeners, making it easier to clean up resources in applications, such as those built with React. In addition to event listeners, the fetch API supports AbortSignal, allowing requests to be aborted if necessary. This is particularly useful in scenarios where a user might want to cancel an ongoing upload or request. The ability to pass the controller reference back to the caller means that cancellation can be handled gracefully. The AbortSignal class also includes static methods like `AbortSignal.timeout()`, which creates a signal that automatically triggers an abort event after a specified duration. This is useful for implementing timeouts on requests without needing to manage a separate controller instance. Another method, `AbortSignal.any()`, allows developers to combine multiple abort signals into one. This is beneficial when you want to manage multiple sources of cancellation without complicating the logic. The versatility of AbortController extends to streams as well. By using the signal in a WritableStream, developers can handle stream cancellations effectively, ensuring that resources are managed properly. One of the most compelling aspects of the AbortController API is its adaptability. Developers can integrate abort functionality into their own logic, such as database transactions. By creating a higher-order function that accepts an abort signal, transactions can be canceled seamlessly, enhancing the user experience. Abort events also come with a reason, which can be specified when calling `controller.abort()`. This reason can be any JavaScript value, allowing for nuanced handling of different cancellation scenarios. In conclusion, the AbortController API is an invaluable tool for JavaScript developers, providing a robust mechanism for managing cancellations across various operations. Whether handling network requests, event listeners, or custom logic, the ability to abort operations enhances the overall functionality and responsiveness of applications. Embracing this API can lead to better user experiences and more maintainable code.