how to use ejs in express code example

Example 1: express ejs

let express = require('express');
let app = express();

app.set('view engine', 'ejs');

app.get('/', (req, res) => {
  res.render('index', {foo: 'FOO'});
});

app.listen(4000, () => console.log('Example app listening on port 4000!'));

Example 2: ejs current year

<%= new Date().getFullYear();%>

Example 3: add one file to another in ejs

<%- include('partials/messages'); %>

Example 4: ejs express layouts

var express = require('express');
var expressLayouts = require('express-ejs-layouts'); 
var app = express(); app.set('view engine', 'ejs');
app.use(expressLayouts); 
app.get('/', function(req, res) { 
  var locals = {    
    title: 'Page Title',    
    description: 'Page Description',    
    header: 'Page Header'  };
  res.render('the-view', locals);
}); app.listen(3000);