```js const Subscribable = require('@janbloch/subscribable-event');
npm install @janbloch/subscribable-eventjs
const Subscribable = require('@janbloch/subscribable-event');
const event = new Subscribable();
const unsubscribe = event.subscribe((arg)=>{
console.log('Hello ' + arg);
});
event.invoke('World');
unsubscribe();
event.invoke('This will not be printed to the console');
`
Output: Hello World`