Learned about templating engines

my_express/index.pug

@@ -0,0 +1,5 @@
+html
+  head
+    title= title
+  body
+    h1= message

my_express/middleware.js

@@ -25,6 +25,27 @@ app.get('/', (req, res, next) => {
     res.end(responseText);
 });
 
+const middlewareFactory = (name, end, skip) => (req, res, next) => {
+    console.log(`Middleware name: ${name}`);
+    if (end) {
+        // Middleware can invoke end anytime.
+        return res.end(`Ended by ${name}`);
+    }
+    if (skip) {
+        // Middleware can also skip entire stack and move to next route/stack.
+        next('route');
+    } else {
+        // next middle from the stack.
+        next();
+    }
+};
+const middlewares = ['A', 'B', 'C', 'D'].map((name, index) => middlewareFactory(name, false, index === 1));
+app.get('/middleware', ...middlewares);
+
+app.get('/middleware', (req, res) => {
+    res.end(req.originalUrl);
+});
+
 app.listen(8000, () => {
     console.log(`Listening at port:`, 8000);
 });

my_express/template_engine.js

@@ -0,0 +1,14 @@
+const express = require('express');
+const path = require('path');
+const app = express();
+const PORT = 8000;
+
+const viewPath = path.normalize(__dirname, '/index.pug');
+
+app.set('view engine', 'pug');
+
+app.get('/', (req, res) => {
+    res.render(viewPath, { title: 'Hello Pug!', message: 'Pug is awesome.' });
+});
+
+app.listen(PORT, () => console.log(`Listening at ${PORT}`));