One of the main reasons that you should use coroutines is to avoid callback hell.
This section will cover the following topics:
- What is a callback?
- Wrapping callbacks
Callback hell
What is a callback?
A callback is a pattern that is used to retrieve the results of an asynchronous task. This approach assumes that we pass a reference to a function that should be invoked when an asynchronous operation is done.
By synchronous operations, we mean that the tasks are executed one after another. The asynchronous approach assumes that several tasks can be performed in parallel.
The loadImage function in the following example code uses a callback to return the result:
fun loadImage(callback: (Image) -> Unit) {
executor.submit...
