Reactive principles

So, what is reactive programming?

It's summarized nicely by the reactive manifesto: https://www.reactivemanifesto.org.

To cite it, reactive programs are:

• Responsive
• Resilient
• Elastic
• Message-driven

To understand these four topics, let's imagine 10 people standing in a line for a cashier. Each one of them can see only the person in front, but not how many people are in the line ahead of that person or what the cashier is doing. Do you have this picture in your mind? Let's start then.

Responsiveness

Would you stand in that line for the cashier?

That depends on the urgency and how much time you have. If you're in a hurry, you'll probably leave empty-handed before reaching the cash...