Let’s Create a Lightweight Native Event Bus in JavaScript
An event bus is a design pattern (and while we’ll be talking about JavaScript here, it’s a design pattern in any language) that can be used to simplify communications between different components. It can also be thought of as publish/subscribe or pubsub.
The idea is that components can listen to the event bus to know when to do the things they do. For example, a “tab panel” component might listen for events telling it to change the active tab. Sure, that might happen from a click on one of the tabs, and thus handled entirely within that component. But with an event bus, some other elements could tell the tab to change. Imagine a form submission which causes an error that the user needs to be alerted to within a specific tab, so the form sends a message to the event bus telling the tabs co...