godel/js/observable.js


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class Observable {
  constructor() {
    this.observers = [];
  }
  subscribe(f) {
    this.observers.push(f);
  }
  unsubscribe(f) {
    this.observers = this.observers.filter((subscriber) => subscriber !== f);
  }
  notify(data) {
    this.observers.forEach((observer) => observer(data));
  }
}