Node Sbks intro

Jak pouzivame node v nasem ninja tymu

Node.js

System postaveny nad JavaScriptovym jadrem V8 z Chrome.

Node.js uses an event loop and callbacks for scalability, instead of processes or threads. Exits the event loop when there are no further callbacks to be performed.

php potrebuje ke svemu spusteni webserver (Apache, Nginx), ktery standardne pro kazdy pozadavek vse nove nastartuje, postupne synchrone provede a po odpovedi vse zapomene, coz takto zni pomale a draze =)

nodejs je samo webserver a standardne bezi v jednom vlakne. Pro kazdy dotaz je vytvoren asynchroni event, ktery je ohendlovan az na nej prijde rada (lightweigt a vetsinou je to rychly)

Instalace

• nvm - Node Version Manager

nvm install v4.4.4
nvm alias default v4.4.4
nvm use default
nvm ls

node -v
npm -v

node # REPL

echo 'console.log("Hello");' > index.js
node index.js

CoffeeScript

A little language that compiles into JavaScript.

npm i coffee-script -g

coffee -v
coffee # REPL

echo 'console.log "Hello"' > index.coffee
coffee index.coffee

• pryc zbytecne znaky
• funkce automaticky vraci posledni hodnotu
• ma to napr tridy, super ale skoro nepouzivame =)

npm

The package manager for JavaScript.

npm i coffee-script -g
npm i async --save
npm i coffeelint --save-dev

package.json

semantic versioning

npm i
npm update

npm test
npm run lint

npm publish
npm version patch/minor/major

modules

# greeter.coffee
privateCau = -> 'Cau'
publicAhoj = -> 'Ahoj'
module.exports.ahoj = publicAhoj

# printer.coffee
greeter = require './greeter.coffee'
console.log greeter.ahoj()

• requires na zacatku souboru

async

• waterfall
• parallel
• each
• map
• retry, series, forEachOf, ....

“error-first” callbacks: (err, res) -> ...

express - minimalist web framework

lodash - utility library

moment - vse okolu casu a timezon

request - curl

socketio - web sockets

npm.ccl

• @sbks/adctd
• @sbks/hera - video

DBs

• elasticsearch
• postgre
• mongo
• redis
• rabbitMQ

Foreman & be-environmentally-aware

• node-foreman
• Procfile

nf start

cson-config

config.cson

echo 'APP_PG=pgsql://user:pass@postgres1.dev1.ccl/sbks_com' > .env

• envio
• maratonec

Testing

• mocha - test framework
• chai - assertion library

Coding Style

• Files - kebabCase my-favourite-file.coffee