Server Side Questions

Question 1

What are the parts of this url https://github.com/mariusbanea/web-developers-toolkit/?key=value&anotherKey=differentValue?

Answer 1

http / https ===> the access protocol
github.com ===> domain name
mariusbanea / web-developers-toolkit ===> both are parameters / routes that we get to send to the domain name (mariusbanea = username; web-developers-toolkit = repository name)
/?key=value&anotherKey=differentValue ===> are usually query that we get to send to the domain name (mariusbanea = username; web-developers-toolkit = repository name)
URLS structure: PROTOCOL + DOMAIN NAME + PARAMETERS + QUERIES

Question 2

What are the typical parts of a server js file?

Answer 2

• import external resources (i.e. Express)
• api end points (app.get)
• app listen with the port settings (app.listen)

Question 3

Is Node primarily a sync or async programing language?

Answer 3

Async ( it’s built on callbacks https://github.com/mariusbanea/web-developers-toolkit/blob/master/js/callback-function-example.html)

Question 4

How many threads does node have?

Answer 4

1 thread (thread = an operation that is happening in the same time with another one)

Question 5

What are the projects suitable for node?

Answer 5

Single thread websites with simple NoSQL DBs and API support

Question 6

What are the three definitions of Mongoose?

Answer 6

1. A middleware connecting the Controller with the Model
2. “validation” layer (validates data between the controller and the model)
3. Object Document Mapper (maps the connection between the Documents inside the DB with the Objects in the controller)

Question 7

How many threads does node have

Answer 7

1 thread (thread = an operation that is happening in the same time with another one)

Question 8

Is Node primarily a sync or async programing language

Answer 8

Async ( it’s built on callbacks )

Question 9

What is a callback function?

Answer 9

A callback is function which is sent as a parameter to another function in order to be used after the initial function runs

Question 10

What is the difference between a SQL database and a NoSQL database?

Answer 10

SQL (Structured Query Language) is a relational data model and NoSQL is a document data model

Question 11

What projects are suitable for node?

Answer 11

Single thread websites with simple NoSQL DBs and API support

Question 12

What is the DOM?

Answer 12

Document-Object-Model, a copy of the code from the server that can be manipulated with javascript

Question 13

What are the parts of a url?

Answer 13

protocol: domain name/parameters ? queries

Question 14

What is the difference between callback, closure, and recursive functions?

Answer 14

• Callback functions are parameters inside of another function that are called after the initial function runs.
• Closures are functions that is written inside another function so the scope of the inner function is protected
• Recursive functions are functions that calls itself repeatedly until the function ends

Question 15

What are RESTful web services?

Answer 15

Clients can make requests to a resources URI that elicits response in HTML, XML or JSON format
- Representational State Transfers

Question 16

Difference between PUT and PATCH?

Answer 16

PUT is used to update a resource and PATCH is used to modify it

Question 17

What are CRUD operations?

Answer 17

Create, Read, Update and Delete - requests made to the server in order to get a response. Typically use GET, POST, PUT, PATCH and DELETE

Question 18

What does MCV stand for?

Answer 18

Model (database), Controller (server), View (client)

Question 19

What are the most common npm apps being used?

Answer 19

express, mocha, chai, morgan, faker, bcryptjs, body-parser, mongo, mongoose

Question 20

Describe the HTTP requests/response life cycle.

Answer 20

The client sends a request and the server sends a response

Question 21

Describe the architecture of a basic Express app. How is it organized?

Answer 21

• a way to listen for HTTP requests over a port
• a way to inspect and interact with HTTP request and response objects
• a way to route HTTP requests from clients to the right request handlers
• a way to serve static assets to client browsers (e.g., our route for /)
• a way to serve data to clients

Question 22

Describe how a Mongo database is structured

Answer 22

Mongo is made up of collections of documents.
A document is an object comprised of keys and values. Mongo accepts strings, integers, floating point decimals, booleans, null, arrays, objects, timestamps, and object ids as value types.

Question 23

What is the purpose of bcrypt in the authentication process?

Answer 23

bcrypt is an adaptive function: over time, the iteration count can be increased to make it slower, so it remains resistant to brute-force search attacks

Question 24

How do JSON web tokens work?

Answer 24

JWT digitally signs tokens to prevent fraud. When the server generates the token, it generates a signature by combining the contents of the token with a secret private key using an encryption algorithm.