refer to: https://www.udemy.com/course/the-web-developer-bootcamp/
cats.ejs
<body> <h1>My baby cats</h1> <%for(let cat of cats){%> <li> <%=cat%> </li> <%}%> </body>
app.get('/cats', (req, res) => {
const cats = ['sweety', 'candy', 'cutey', 'honey'];
res.render('cats.ejs', { cats })
})