Will Javascript Es6 Promise Support Done Api

JavaScript ES6 Promises are an essential part of asynchronous programming in the JavaScript language. If you're wondering about the support for the `done` API in JavaScript ES6 Promises, let's dive in and explore this topic further!

The `done` API is not a standard part of JavaScript ES6 Promises. It's actually a method found in some Promise libraries like Q.js, which adds extra functionality to Promises. The `done` method is typically used to terminate Promise chains and handle any uncaught errors that might occur during the execution of the Promise chain.

In native ES6 Promises, the closest method to `done` is `finally`. The `finally` method is used to specify a function to be executed when the Promise is settled, whether it's fulfilled or rejected. This can be helpful for cleanup tasks or final actions that need to be performed regardless of the Promise's outcome.

To demonstrate this, consider the following example code using ES6 Promises:

function fetchData(url) {
  return fetch(url)
    .then(response => response.json())
    .then(data => {
      // Process the data
    })
    .catch(error => {
      console.error('An error occurred:', error);
    })
    .finally(() => {
      console.log('Promise completed, regardless of success or failure');
    });
}

fetchData('https://api.example.com/data')
  .then(() => {
    console.log('Data fetched successfully!');
  });

In this code snippet, the `finally` method is used to log a message indicating that the Promise has completed, regardless of whether it was fulfilled or rejected. This can be useful for logging, cleanup tasks, or any other final actions you need to perform after the Promise chain has completed its execution.

While ES6 native Promises do not have a built-in `done` method like some Promise libraries, you can achieve similar functionality using the `finally` method. This allows you to handle cleanup tasks and finalize operations in a more structured and organized manner within your Promise chains.

In conclusion, if you're looking for the `done` API in JavaScript ES6 Promises, remember that it's not a standard feature of native Promises. Instead, leverage the `finally` method available in ES6 Promises to achieve similar effects and ensure your Promise chains are well-maintained and error-handled. Happy coding!