NodeJS

Nodejs/Factory/factory.js

@@ -0,0 +1,10 @@
+function MyClass (options) {
+  this.options = options;
+}
+
+function create(options) {
+  // modify the options here if you want
+  return new MyClass(options);
+}
+
+module.exports.create = create;

Nodejs/observers/MyFancyObservable.js

@@ -0,0 +1,38 @@
+// MyFancyObservable.js
+
+// Reference from: https://blog.risingstack.com/fundamental-node-js-design-patterns/
+
+// var util = require('util');
+// var EventEmitter = require('events').EventEmitter;
+
+// function MyFancyObservable() {
+//   EventEmitter.call(this);
+// }
+
+// util.inherits(MyFancyObservable, EventEmitter);
+
+// MyFancyObservable.prototype.hello = function (name) {
+//   this.emit('hello', name);
+// };
+
+// ---------------
+
+// Code improved
+var EventEmitter = require('events').EventEmitter;
+
+class MyFancyObservable extends EventEmitter {
+  constructor() {
+    super();
+    EventEmitter.call(this);
+  }
+
+ hello(name) {
+  this.emit('hello', name);
+ }
+
+ writeInAgenda() {
+   this.emit('write-firestore-agents-agenda', { visit: { code: '989' }});
+ }
+}
+
+module.exports = MyFancyObservable;

Nodejs/observers/testing.js

@@ -0,0 +1,26 @@
+var MyFancyObservable = require('./MyFancyObservable');
+var observable = new MyFancyObservable();
+
+observable.on('hello', (name) => {
+  setTimeout(() => {
+    console.log(name, new Date().toString())
+  }, 1000)
+
+  process.nextTick();
+});
+
+
+observable.on('write-firestore-agents-agenda', (newVisit) => {
+  // do some stuff
+  console.log('write-firestore-agents-agenda', new Date().toString());
+});
+
+// observable.hello('john');
+// observable.writeInAgenda();
+
+const SayHello = () => Promise.resolve(observable.hello('john'))
+const WriteAgenda = () => Promise.resolve(observable.writeInAgenda())
+
+
+const promises = Promise.all([SayHello(), WriteAgenda()])
+