Events proof of concept.js

const event = {
  value: null,
  subscriptions: [],
  subscribe: function (callback) {
    this.subscriptions.push(callback);
  },
  next: function (value) {
    this.value = value;
    this.subscriptions.forEach((subscription) => {
      subscription(value);
    });
  },
};

const moduleA = () => {
  event.subscribe((value) => {
    console.log("Hello from module A, " + value);
  });
};

const moduleB = () => {
  event.subscribe((value) => {
    console.log("Hello from module B, " + value);
  });
};

const a = moduleA();
const b = moduleB();
for (let i = 0; i < 10; i++) {
  event.next(i);
}

/* Output: 
    Hello from module A, 0
    Hello from module B, 0
    Hello from module A, 1
    Hello from module B, 1
    Hello from module A, 2
    Hello from module B, 2
    Hello from module A, 3
    Hello from module B, 3
    Hello from module A, 4
    Hello from module B, 4
    Hello from module A, 5
    Hello from module B, 5
    Hello from module A, 6
    Hello from module B, 6
    Hello from module A, 7
    Hello from module B, 7
    Hello from module A, 8
    Hello from module B, 8
    Hello from module A, 9
    Hello from module B, 9
*/