Conventions

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: "At the time of the writing, the currently active version was node.js 0.10.33."

A block of code is set as follows:

var Dungeon = function(cells) {
  this.cells = cells
  this.bookedCells = 0
}

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

var dungeons = {}
Dungeon.find = function(id, callback) {
  if(!dungeons[id]) {
    dungeons[id] = new Dungeon(100)
  }

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

$ npm install –g express

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: "Clicking on the Next button moves you to the next screen."