Node Exercises

Node exercises solved during Skylab Coders Academy's MEAN Stack bootcamp

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

My solution

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

My solution

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

link.txt My solution

##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()

My solution

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...

My solution

6. Processing values

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

Hint: You need npm module -> concat-stream

My solution

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

My solution

##8. Show Hour Write a node.JS program that shows you the local hour of server.

Hint: You need npm module -> strftime

My solution

##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..

My solution

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

My solution

##11. Creating HTML Write a node.JS program that create a HTML file. Access this HTML with http://localhost:8080 from your browser

Hint: You need npm module -> html

My solution

##12. Creating HTML II Write a node.JS program that create a HTML file with a JavaScript function inside that say: "Hello!" Access this HTML with http://localhost:8080 from your browser

Hint: You need npm module -> html

My solution

##13. JSON Write a node.JS program that read a JSON file and show you some propierties for console.

JSON FILE:
    {
         "username":"xyz",
         "password":"xyz@123"
         "email":"xyz@xyz.com",
         "id": 0001
    }

Read username, password, email and id,

My solution

14 JSON II - Read JSON From File System

Write a node.JS program that read a JSON object and show the propierties for console

My solution

15 JSON III - Delete An Element From A JSON Object

Write a node.JS program that read a JSON file and delete one propierty.

My solution

16 JSON IV - Iterate

Write a node.JS program that read a JSON file and show you some propierties for console with itinerate values

My solution

17 JSON V - Check Key

Write a node.JS program that read a JSON file and compare if propierties exist in JSON file.

My solution

18 JSON VI - Comparing Two JSON !!!!!!!Final Challenge

Write a node.JS program that read two JSON files and compare if propierties are same in both files and show success message when the comparation it's over.

Hint:

    if(typeof o1[keyPair[0]] == typeof o2[keyPair[1]] == "object")         {
    return deepEquals(o1[keyPair[0]], o2[keyPair[1]])
    } else {
    return o1[keyPair[0]] == o2[keyPair[1]];

CAUTION, some process like Create HTML or Petitions to servers need close the previous conexion before execute another new.

My solution