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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | 143x 143x 143x 143x 143x 15x 15x 15x 15x 143x 23x | export class Observer<T> {
private subscribers: Array<(observed: T) => void>;
observed: T | null;
constructor() {
this.subscribers = [];
this.observed = null;
}
subscribe = (subscriber: (newObserved: T | null) => void) => {
this.subscribers.push(subscriber);
// unsubscribe function
return () => {
const index = this.subscribers.indexOf(subscriber);
this.subscribers.splice(index, 1);
};
};
publish = (data: T | null) => {
this.subscribers.forEach((subscriber) => subscriber(data));
};
}
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