w2

Question 1

purpose of MEAN

Answer 1

purpose is to use only JS to cover diff parts of applications

Question 2

Advantage of MEAN

Answer 2

1. single language throughout app

2.supports MVC architecture

3. Data marshalling using JSON objects- transforming the memory representation of an object into another format, which is suitable for storage

Question 3

Node.js

Answer 3

For browser
two-way comm b/w browser and server

Question 4

JS- event driven language meaning?

Answer 4

• event-driven language- register code to events, code executed when event is executed- allows async programming -single thread aka event loop - when there is event created sent to event queue - sends task to event handler

Question 5

Why node.js?

Answer 5

Node.js eliminates the waiting and continues with the next request. Node.js runs single-threaded, non-blocking, asynchronously programming, which is very memory efficient.

Question 6

node.js syntax, data types?

Answer 6

Similar to front end JS

Six data types that are primitives:

Boolean

Null

Undefined

Number

String

Symbol (new in ECMAScript 2015)

and Object

Question 7

What is JS primary design flaw?

Answer 7

design flaws is the sharing of a single global namespace

Question 8

Built-in modules Node.js

Answer 8

Node.js has a set of built-in modules that can be used without further installation

Question 9

to export?

Answer 9

module.exports = Student;
class name

Question 10

to import?

Answer 10

To import a package, you have to use the required keyword

Question 11

define properties of appplication in node.js?

Answer 11

package.json->specify the version of your current release, the name of your application, and the main application file.

Question 12

how to create new package.json file?

Answer 12

npm init

Question 13

express?

Answer 13

added in package.json as dependency
in node_modules file too

Question 14

HTTP ?

Answer 14

HTTP is the abbreviation of “HyperText Transfer Protocol”.

The HTTP server is the program that serves data to clients using the HTTP protocol.

Question 15

HTTP works?

Answer 15

client sends request to server

server accepts the request and generates a response using its local database or files

the server sends back its response to the client

the client’s browser displays/renders the response

Question 16

What is the HTTP.createServer() method?

Answer 16

The http.createServer() method turns your computer into an HTTP server by creating a HTTP Server object.

Question 17

What can the HTTP.createServer() method do?

Answer 17

The HTTP Server object can listen to ports on your computer and execute a function, a request listener, each time a request is made.

Question 18

createServer method?

Answer 18

requires a callback method (i.e. requestListener) as an input parameter

with each new request, the callback method will be invoked and provided with two parameters: request and response

Question 19

Request object?

Answer 19

using the request object, you can get details about the coming request such as the method, URL, headers, and body of the request

Question 20

Response object?

Answer 20

the response object contains many useful methods for sending data back to the client

Question 21

res.writeHead()?

Answer 21

The argument of the res.writeHead() method is the status code, 200 means that all is OK, 404 is page not found

Question 22

fs Node.js?

Answer 22

fs: the Node.js file system module allows you to work with the file system on your computer.

Question 23

fs callback?

Answer 23

The callback is passed two arguments (err, data), where data is the contents of the file

Question 24

Query string?

Answer 24

Is the part of a URL containing data that does not fit conveniently into a hierarchical path structure. For example:

http://example.com/over/there?name=Tim&age=20

starts with a question mark character (?)

Parameters are key-value pairs that can appear inside the URL path

Query string appears after the path (if any)

multiple query parameters are separated by the ampersand, “&”

Question 25

How to split the query string into readable parts in Node.js?

Answer 25

using a function called ‘parse’, which is part of the ‘url’ module

‘searchParams’ returns an object representing the query parameters of the URL.

use the 'get' to extract the value of a given key

Question 26

URL routing

Answer 26

changing file when pathname changes

Question 27

http.createServer(function (request, response) {
//….
}

If a server wants to respond to a client’s request by a string, it has to use:

Answer 27

response.write() method

Question 28

https://monash.edu:8900/fit/fit2095/?q=2&mark=10

Identify the following:

The query string
The protocol
The port number
The pathname
The server address

Answer 28

The query string- ?q=2&mark=10
The protocol- https://
The port number- 8900
The pathname- /fit/fit2095/
The server address- monash.edu

Question 29

string to int?
int to string?

Answer 29

parseInt
.toString()