Now that we have met our first example of callback hell, we know what we should definitely avoid; however, that's not the only concern when writing asynchronous code. In fact, there are several situations where controlling the flow of a set of asynchronous tasks requires the use of specific patterns and techniques, especially if we are using only plain JavaScript without the aid of any external library. For example, iterating over a collection by applying an asynchronous operation in sequence is not as easy as invoking forEach() over an array, but it actually requires a technique similar to a recursion.
In this section, we will learn not only about how to avoid the callback hell but also about how to implement some of the most common control flow patterns using only simple and plain JavaScript.