In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows:

"In the preceding case, the setTimeout() method is provided by JavaScript (Node.js) API."

A block of code is set as follows:

var http = require('http');
http.createServer(function(req, res) {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello World
');
}).listen(8080, 'localhost');
console.log('Server running at http://localhost:8080'); 

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

app.engine('Handlebars', exphbs.create({ 
    defaultLayout: 'main', 
    layoutsDir: app.get('views') + '/layouts', 
    partialsDir: [app.get('views') + '/partials'], 
    helpers: { 
        timeago: (timestamp)=> { 
            return moment(timestamp).startOf('minute').fromNow(); 
        } 
    } 
}).engine); 

Any command-line input or output is written as follows:

$ sudo apt-get install python-software-properties
$ sudo curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
$ sudo apt-get install nodejs

New terms and important words are shown in bold. Words that you see on the screen, for
example, in menus or dialog boxes, appear in the text like this:
A great alternative on the Mac is iTerm2.