In the previous part [https://vane.life/2015/08/24/write-your-own-async-task-queue-2/], we've made the task queue usable. However, for better performance, we usually want multiple tasks in the queue run simultaneously. What comes to your mind first? Start Multiple Tasks Simultaneously We are dealing with an asynchronous issue,

Continue with the previous part [https://vane.life/2015/08/23/write-your-own-async-task-queue-1/], in which we created a task queue that's able to execute asynchronous tasks one by one if no error occurs. Now we'll do more with it and make it really usable. Handle Errors In

It should be quite simple for a qualified JavaScript programmer to write an asynchronous task queue. If you are not sure about it, you may take this tutorial a test of your skill as well. Goals Sometimes in practice we need to queue specific tasks due to varieties of reasons: