The events api

Author: Colin Lee

node-api/events.js

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+const EventEmitter = require('events');
+
+class MyEmitter extends EventEmitter {}
+
+const myEmitter = new MyEmitter();
+// myEmitter.on('event', () => {
+//   console.log('an event occurred');
+// });
+// myEmitter.emit('event');
+
+// myEmitter.on('event', function (a, b) {
+//   console.log(a, b, this);
+// });
+// myEmitter.on('event', (a, b) => {
+//   console.log(a, b, this);
+// });
+// myEmitter.emit('event', 'a', 'b');
+
+// myEmitter.on('event', function (a, b) {
+//   setImmediate(() => {
+//     console.log('this happens asynchronously');
+//   });
+// });
+// console.log('1')
+// myEmitter.emit('event', 'a', 'b');
+// console.log('2')
+
+// let m = 0;
+// myEmitter.once('event', () => {
+//   console.log(++m);
+// });
+// myEmitter.emit('event');
+// myEmitter.emit('event');