24 lines
628 B
JavaScript
24 lines
628 B
JavaScript
class EventEmitter {
|
|
constructor() {
|
|
this.handlers = {}
|
|
}
|
|
|
|
emit(event, value) {
|
|
this.handlers[event]?.forEach(h => h(value));
|
|
}
|
|
|
|
addHandler(event, handler) {
|
|
if(!this.handlers[event]) {
|
|
this.handlers[event] = [handler];
|
|
} else {
|
|
this.handlers[event].push(handler);
|
|
}
|
|
}
|
|
}
|
|
|
|
const emitter = new EventEmitter();
|
|
emitter.addHandler("numberChange", n => console.log("New number value is: ", n));
|
|
emitter.addHandler("stringChange", s => console.log("New string value is: ", s));
|
|
emitter.emit("numberChange", 1);
|
|
emitter.emit("stringChange", "3");
|