Node

Question 1

http.createServer - what to require

Answer 1

var http = require(‘http’);

Question 2

http.createServer - hello world

Answer 2

http.createServer(function(req,res){
res.writeHead(200,{‘Content-Type’: ‘text/html’});
res.end(‘Hello World’);
}).listen(8080);

Question 3

use the “exports” keyword to make properties and methods available outside the module

Answer 3

exports.myDateTime = function() {
return Date();
}

Question 4

include a module

Answer 4

var dt = require(‘./myfirstmodule’);

Question 5

what does the built-in Node module ‘http’ do

Answer 5

allows to transfer data over the HTTP protocol

Question 6

If the response from the HTTP server is supposed to be displayed as HTML…

Answer 6

include HTTP header with the correct content type

res.writeHead(200, {‘Content-Type’: ‘text/html’})

Question 7

the function passed into http.createServer has req argument - it represents…

Answer 7

the request from the client, as an object (http.IncomingMessage)

Question 8

the built-in URL module can easily _ query string

Answer 8

split into readable parts

Question 9

URL can have a query in it, using URL module, like this

Answer 9

var q = url.parse(req.url, true).query //will pick apart the url query
var txt = q.year + " " + q.month //will render in text

in the URL, put /?year=2017&month=July and it will use these values in txt

Question 10

file system (‘fs’) allows to work with the file system. use for …

Answer 10

reading, creating, updating, renaming and deleting files

Question 11

read files with

Answer 11

fs.readFile()

Question 12

how to read in an HTML file

Answer 12

inside http.createServer you place another function with fs.readFile('index.html',function(err,data){
//res.writeHead...
//res.write...
}

Question 13

FS module has these methods for creating files

Answer 13

fs. appendFile()
fs. open()
fs. writeFile()

Question 14

fs.appendFile() does…

Answer 14

appends specified content to a file

if the file doesn’t exist, it creates it

Question 15

fs.open() takes a flag as second argument

Answer 15

if the flag is ‘w’ for writing, the specified file is open for writing

if the file doesn’t exist, an empty one is created

Question 16

fs.writeFile()

Answer 16

replaces the specified file and content if it exists

if the file doesn’t exist, a new file with the new specified content will be created

Question 17

to delete a file with FS…

Answer 17

use the fs.unlink() method

Question 18

rename files with

Answer 18

fs.rename(old name, new name)

Question 19

url.parse() does…

Answer 19

parses an address, returns a URL object with each part of the address as properties

url.parse(address, true)

Question 20

The NPM program is installed on your computer

Answer 20

when you install Node.js

Question 21

A package in Node.js contains

Answer 21

all the files you need for a module.

Question 22

Modules are JavaScript

Answer 22

libraries you can include in your project.

Question 23

NPM creates a folder named

Answer 23

“node_modules”, where the package will be placed. All packages you install in the future will be placed in this folder.

Question 24

Include the newly installed package

Answer 24

the same way you include any other module:
var uc = require('upper-case');

Question 25

Node.js is perfect for ___ applications.

Answer 25

event-driven

Question 26

Objects in Node.js can fire

Answer 26

events, like the readStream object fires events when opening and closing a file

Question 27

Node.js has a built-in module, called “Events”,

Answer 27

where you can create-, fire-, and listen for- your own events.

include with require(‘events’)

Question 28

all event properties and methods are an instance of an

Answer 28

EventEmitter object

Question 29

To be able to access these properties and methods, create an EventEmitter object:

Answer 29

var events = require('events');
var eventEmitter = new events.EventEmitter();

Question 30

with the EventEmitter object You can assign

Answer 30

event handlers to your own events

Question 31

To fire an event

Answer 31

use the emit() method.

Question 32

a very good module for working with file uploads

Answer 32

Formidable

Question 33

When the file is uploaded and parsed, it gets placed..

Answer 33

on a temporary folder on your computer

Question 34

The path to this temp directory can be found in the

Answer 34

“files” object, passed as the third argument in the parse() method’s callback function

Question 35

send emails from your computer

Answer 35

Nodemailer module