Node lt

NodeJS, CS y ExpressJS
Como programar solo en JavaScript
y no morir en el intento.

“es una plataforma construida sobre el
Javascript runtime de Chrome, con el fin de
construir aplicaciones de red rápidas y
escalables.”

- http
- net(tcp)
- udp
- fs
- dns
- etc...
Muchos modulos

HTTP Server de ejemplo
var http = require('http');
http.createServer(function (request, response) {
response.writeHead(200, {'Content-Type': 'text/plain'});
response.end('Hello Worldn');
}).listen(8124);
console.log('Server running at http://127.0.0.1:8124/');

- single threaded
- todo I/O es no bloqueante
- muchos callbacks
- no bloquear el reactor
Event Loop

Require()
//mate.js
var mate = {
cuadrado: function(x) {
return x * x
},
cubo: function(x) {
return x * cuadrado(x);
}
};
module.exports = math;
//otro.js
var express = require('express')
var mate = require('./mate.js')
mate.cuadrado(2);
mate.cubo(2);

- Instalar modulos:
Node Package Manager
npm install express
- Manejar dependencias (definidas en package.json):
npm install
gem install sinatra
bundle install
- Congelar dependencias:
npm shrinkwrap Gemfile.lock

package.json
{
"name": "TicTacToeNODE",
"version": "1.0.0",
"description": "",
"main": "app.js",
"engines": {
"node": "~1.4.28"
},
"dependencies": {
"body-parser": "^1.10.1",
"express": "^4.10.7",
"express-session": "^1.10.0",
"mongodb": "^1.4.28"
},
"devDependencies": {
"coffee-script": "^1.8.0"
},
"author": "",
"license": "ISC"
}

Dato Curioso
rubyGems: 94,343 gems (desde 2003).
npm: 116,873 packages (desde 20011).

- lenguaje que compila a javascript.
- es directamente compatible con librerías.
javascript (y vice-versa).
- sintaxis bonita. :D
- tiene su propia consola para node.

numero = 15
numeros = [1, 2, 3]
nombres = [
'Santi'
'Miguel'
'Mati'
]
cuadrado = (x) ->
x * x
mate =
cuadrado: (x) ->
x * x
cubo: (x) ->
x * cuadrado x
if numero > 10
console.log "Un numero: #{numero}"
console.log("Un numero: #{numero}") if numero > 10
var numero = 15;
var numeros = [1, 2, 3];
var nombres = ['Santi',
'Miguel',
'Mati'];
var cuadrado = function(x) {
return x * x
};
var mate = {
cuadrado: function(x) {
return x * x
},
cubo: function(x) {
return x * cuadrado(x);
}
};
if (numero > 10) {
console.log("Un numero: " + numero);
};
Javascript Coffeescript

Clases
class WinConditionRow
constructor: (rowNumber) ->
@rowNumber = rowNumber
hasWon: (board, player) ->
board[@rowNumber].every (cell) ->
cell == player
winCondition = new WinConditionRow(1)
winCondition.hasWon(board, player)
class Persona
constructor: (nombre, apellido) ->
@nombre = nombre
@apellido = apellido
obtenerNombreCompleto: ->
"#{@nombre} #{@apellido}"
class Doctor extends Persona
obtenerNombreCompleto: ->
"Dr. #{super()}"

Listas y bucles
num for num in [1..10]
game.getId() for game in games when game.isFinished()
for game in games
do (game) ->
game.play player, 0, 0
console.log game.getBoard()

ExpressJS
- framework web similar a Sinatra.
- super minimalista y modular.
express = require 'express'
app = express()
app.get '/', (req, res) ->
res.send 'Hello World!'
app.listen 3000

get '/match_ups' do
currentPlayerId = session[:player_id]
{player_id: currentPlayerId,
match_ups_pending_id: getPendingMatchUpsFor(currentPlayerId),
match_ups_finished_id: getFinishedMatchUpsFor(currentPlayerId)
}.to_json
end
app.get '/match_ups', (req, res) ->
currentPlayerId = req.session.playerId
resJSON =
player_id: currentPlayerId
match_ups_pending_id: pendingMatchUpIdsBy currentPlayerId
match_ups_finished_id: finishedMatchUpIdsBy currentPlayerId
res.send resJSON
express
Sinatra

session = require 'express-session'
bodyParser = require 'body-parser'
app.use express.static("#{__dirname}/public")
app.use bodyParser.json()
app.use session(cookieConfig)
app.post '/play_match_up/:match_up_id', (req, res) ->
gameId = parseInt req.params.match_up_id
i = parseInt req.body.i
j = parseInt req.body.j
game = getGameById(gameId)
game.play req.session.playerId, i, j
res.sendStatus 200

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