GuillermoPena

# CheckIO - Home Challenge 8 : Roman Numerals
# http://checkio.org

# Roman numerals come from the ancient Roman numbering system. 
# They are based on specific letters of the alphabet which are combined
# to signify the sum (or, in some cases, the difference) of their values.
# The Roman numeral system is decimal based but not directly positional and does not include a zero. 
# Roman numerals are based on combinations of these seven symbols:
# Symbol Value
#     I 1 (unus)

GuillermoPena

# CheckIO - Home Challenge 7 : Feed Pingeons
# http://checkio.org

# I start to feed one of the pigeons. 
# A minute later two more fly by and a minute after that another 3. 
# Then 4, and so on (Ex: 1+2+3+4+...). 
# One portion of food lasts a pigeon for a minute, but in case there's not enough food for all the birds, 
# the pigeons who arrived first ate first. 
# Pigeons are hungry animals and eat without knowing when to stop. 
# If I have N portions of bird feed, how many pigeons will be fed with at least one portion of wheat?

GuillermoPena

# CheckIO - Home Challenge 6 : Speech Module
# http://checkio.org

# Stephen's speech module is broken. This module is responsible for his number pronunciation. 
# He has to click to input all of the numerical digits in a figure, so when there are big numbers it can take him a long time. 
# Help the robot to speak properly and increase his number processing speed by writing a new speech module for him. 
# All the words in the string must be separated by exactly one space character. 
# Be careful with spaces -- it's hard to see if you place two spaces instead one.
# Input: A number as an integer.
# Output: The string representation of the number as a string.

GuillermoPena

// How to create a simple web service with Express

// In App.js
// Dependencies
var express = require('express')
  , http    = require('http')
  , port    = 8080

// Application
var app = express()

GuillermoPena

// Managing websocket with socket.io
// Setting a web socket and sending a message from client to server.

// Server side
var app    = require('express')()
  , util   = require('util')
  , server = require('http').createServer(app)
  , io     = require('socket.io').listen(server)
  , port   = 8013

GuillermoPena

// How to send message from A user to B user, encrypting it (asymetric cryptology) and sign it

var ursa      = require('ursa')
  , message   = 'Hello world!'
  , encoding  = 'base64'
  , buffer    = new Buffer(message, 'ascii')

// Creating a pair of keys of user A (a private key contains both keys...)
console.log('Generating Keys Pair of user A...')
var keysA = ursa.generatePrivateKey()

GuillermoPena

// All you need to know about Mocha testing in 60 lines

// Mocha Testing: http://visionmedia.github.io/mocha/
// Installation: npm install -g mocha
// Run:     mocha [test folder or test file]
// Example: mocha . (Run all js tests in folder)
// 
// Usefull parameters:
// 	mocha -w . : Watch file changes and re-run tests
// 	mocha -d . : Debug mode

GuillermoPena

// How to encrypt/decrypt with ursa module (asymmetric cryptology)
var ursa     = require('ursa')
  , message  = 'Hello world!'
  , encoding = 'base64'

// Creating a pair of keys (a private key contains both keys...)
console.log('Generating Keys Pair...')
var keys = ursa.generatePrivateKey()

// Making a private key

GuillermoPena

var crypto     = require('crypto')
  , fs         = require('fs')

var sourceFile = __dirname + "/testFile.txt"
  , targetFile = __dirname + "/testEncryptedFile.txt"
  , key        = "SecretKey"
  , algorithm  = 'aes192' // Another algorithms: 'des-ede3-cbc'
  , cipher     = crypto.createCipher(algorithm, key)
  , decipher   = crypto.createDecipher(algorithm, key)
  , rs         = fs.ReadStream(sourceFile)

GuillermoPena

var varName1 = "varName2"
global[varName1] = "Hello World" // This is the important line ;)
var staticVarName = global[varName1] 

console.log("Var1: Name/Value : varName1/" + varName1)
console.log("Var2: Name/Value : " + varName1 + "/" + global[varName1])
console.log("Static Var: Name/Value : staticVarName/" + staticVarName)