Node.js natively provides us with a useful module called EventEmitter that allows us to get started incorporating Event-Driven Programming in our project right away. A Main Loop listens for event triggers and calls the associated event handler for that event.An Event Handler is a callback function that will be called when an event is triggered.These events have associated functions that, when triggered, are executed to make a change to the user interface in some way.Įvent-Driven Programming makes use of the following concepts: When you press a key a keydown event is triggered. When you click a button a click event is triggered. Overviewįor the most recognizable example of Event-Driven Programming for people at any level of programming skill, we’ll turn to our old friend The Web Browser.Įvery time you interact with a webpage through it’s user interface, an event is happening. Check any major framework or software out there and odds are you’ll find evidence of Event-Driven Programming.
You’ll find that the concept is rather ubiquitous. Most developers are introduced to concepts of Event-Driven Programming early on in their study of programming yet they might not fully realize it until a bit later.
In this article we’re going to go over how Event-Driven Programming works and how we can make the best use of it in our Node.js projects. Event-Driven Programming is a logical pattern that we can choose to confine our programming within to avoid issues of complexity and collision.
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