Node Exercises

This repository contains NodeJS exercises made in the Skylab Coders Academy Full Stack Web Development Bootcamp.

0. Calculator Node

Create a app.js that require another file called calculator.js When we call node app.js we should show in the console the following:

The sum of 3 & 7 is: 10 The multiplication of 3 & 7 is: 21

app.js should only show in the console the result of calling the functions sum & multiplication

These methods should be defined (and exported) in calculator.js

Phase 2

Create a folder called operations and create in every folder a file exporting every operation needed in the main app.js file

app.js operations/ sum.js multiplication.js substraction.js division.js

Phase 3

Install the module moment and use it to show the current time in this way:

Today is : Monday, October 31st 2016, 10:08:34 am The sum of 3 & 7 is: 10 The multiplication of 3 & 7 is: 21

• Code

1. Connection to the server

Write a node.JS program that execute a connection to server and return success message like "Success, i'm listening from port: 3000"

Hint: Yo u need npm module - http

Extra

Set the port of the connection using an environment variable PORT

• Code

2. Show Content

Write a node program that read a file (passed as parameter) in local machine and shows in the console the content of it.

node app.js test.txt

Hint: You need npm module - fs

• Code

3. HTML Code

Write a node.JS program that read and shows in the console the html code of one external page. The link of the external page should be read from a file link.txt

Hint: You need npm module -> request

• Code

##4. File list

Write a node.JS program that list the content of the current directory indicating if is a directory or a file

$ node ex4.js 
FILE:ex1.js
FILE:ex2.js
FILE:ex3.js
FILE:ex4.js
FILE:getLinksNode.js
FILE:link.txt
DIR :node_modules
FILE:recursiveContentsDir.js
FILE:results.txt
FILE:test.txt

Hint: You need fs.readdirSync, fs.lstatSync and isDirectory()

• Code

5. Writing on txt

Write a node.JS program that creates a txt file with the text passed as a parameter

$ node ex5.js "hey ho! let's go"
The file was saved!
$ cat myText.txt 
hey ho! let's go

Hint: You need fs.writeFile

Extra:

Improve the previous exercise to user the first parameter as the name of the destination file

More Extra:

Improve the previous exercise to also read and shows in the console the content of the file

$ node ex5.js mySuperText.txt "it's a long way to the top..."
The file was saved!
it's a long way to the top...

$ cat mySuperText.txt 
it's a long way to the top...

• Code

6. Processing values

Write a node program that process local txt and return values as a Array.

Hint: You need npm module -> concat-stream

• Code

7. Parse external webpage (difficult!!)

Write a node program that read the page https://nodejs.org/api/all.html and writes in a file (and shows it content after reading it) the internal links that contain some text passed as a parameter.

$ node getLinksNode.js createServer The file was saved! https://nodejs.org/api/all.html#http_http_createserver_requestlistener https://nodejs.org/api/all.html#https_https_createserver_options_requestlistener https://nodejs.org/api/all.html#net_net_createserver_options_connectionlistener https://nodejs.org/api/all.html#tls_tls_createserver_options_secureconnectionlistener

$ node getLinksNode.js readFile The file was saved! https://nodejs.org/api/all.html#fs_fs_readfile_file_options_callback https://nodejs.org/api/all.html#fs_fs_readfilesync_file_options

• Code

8. Show hour

Write a node.JS program that shows you the local hour of server.

Hint: You need npm module -> strftime

• Code

9. Compare values

Write a node.JS program that search information in .txt file and returns you how much coincidences find.

If you search about "John", and in your txt files are 2 John, should return 2

Hint: You can try save all data in one array and compare with search..

• Code

10. Saving

Write a node.JS program that sum all integers saved in other txt file.

• Code