Future design pattern
The Future design pattern (also called Promise) is a quick and easy way to achieve concurrent structures for asynchronous programming. We will take advantage of first class functions in Go to develop Futures.
Description
In short, we will define each possible behavior of an action before executing them in different Goroutines. Node.js uses this approach, providing event-driven programming by default. The idea here is to achieve a fire-and-forget that handles all possible results in an action.
To understand it better, we can talk about a type that has embedded the behavior in case an execution goes well or in case it fails.
In the preceding diagram, the main function launches a Future within a new Goroutine. It won't wait for anything, nor will it receive any progress of the Future. It really fires and forgets it.
The interesting thing here is that we can launch a new Future within a Future and embed as many Futures as we want in the same Goroutine (or new ones). The idea...
